Grounds for a Criminal Appeal in Michigan: Errors That Can Overturn a Conviction or Sentence

A witness changed a story. The judge excluded evidence. A defense attorney never contacted someone who could have helped. The sentence seemed far more severe than the circumstances justified.

Each concern deserves attention. But the question on appeal is not simply whether something went wrong. It is whether the mistake supports a legal claim, can be established through the proper record, and warrants a remedy under the governing standard.

Grounds for a criminal appeal in Michigan may include insufficient evidence, ineffective assistance of counsel, evidentiary errors, unconstitutional searches or interrogations, prosecutorial misconduct, suppressed evidence, jury-related errors, invalid pleas, and sentencing errors. Newly discovered evidence may support relief through an appropriate trial-court or post-conviction proceeding. None of these labels, standing alone, establishes a right to reversal.

This guide focuses on identifying and evaluating potential grounds for relief. For the procedural sequence, see our Michigan criminal appeal process guide. Most examples concern Michigan circuit-court criminal cases; misdemeanor and other proceedings may follow different appellate routes.

What makes an error a viable appellate issue?

A useful review asks five questions:

1. What rule, statute, or constitutional protection was violated?
2. Where is the proof—in the existing record, or in evidence that must be developed?
3. Was the issue preserved, forfeited, or affirmatively waived?
4. What standard governs review and the effect of the error?
5. What relief would actually correct the problem?

Consider a hypothetical identification case. Saying that a witness was unreliable invites the appellate court to reconsider credibility, which it generally will not do. Showing that the defense was improperly prevented from exposing a specific source of bias presents a different question. The lawyer must then explain why that restriction mattered in light of the other evidence.

The strength of an appeal usually lies in that connection between law, record, and consequence—not in the number of complaints listed in a brief.

Fifteen potential grounds for relief

1. Insufficient evidence of an essential element

The prosecution must prove every element of the offense beyond a reasonable doubt. A sufficiency challenge asks whether a rational factfinder could have found those elements when the evidence is viewed in the prosecution’s favor. Circumstantial evidence and reasonable inferences count; the reviewing court does not simply substitute its credibility choices for the jury’s. See People v Nowack, 462 Mich 392, 399–400 (2000).

The useful starting point is the statute: What exactly had to be proved? The missing element might concern identity, intent, possession, causation, or a circumstance required for the charged degree of the offense.

This is different from arguing that the verdict was against the great weight of the evidence. The tests and potential remedies differ. Review the trial exhibits as well as the transcript before concluding that proof was missing.

Read our detailed discussion of insufficient evidence in a Michigan criminal appeal.

2. Ineffective assistance of counsel

A lawyer’s mistake is not automatically constitutionally ineffective assistance. Ordinarily, the defendant must establish objectively unreasonable performance and a reasonable probability of a different outcome without that deficient performance. The prejudice inquiry is not merely whether better representation was imaginable. See Strickland v Washington, 466 US 668, 687–694 (1984).

Potential issues include inadequate investigation, failure to pursue a viable suppression motion, uninformed decisions about experts, or damaging plea advice. Calling an omission “strategy” does not settle whether the investigation supporting that choice was reasonable. People v Trakhtenberg, 493 Mich 38, 51–55 (2012), illustrates that distinction.

For example, a missing alibi witness matters only if counsel can establish what the witness could have said, why the witness was not presented, and how the testimony bears on the prosecution’s case. An evidentiary hearing may be necessary; a defendant’s unsupported description of the missing testimony is not an adequate substitute.

Our guide to ineffective assistance of counsel and Ginther hearings explains how these claims are developed.

3. Improper admission or exclusion of evidence

Evidence disputes can determine what story the jury is permitted to hear. Potential issues include inadmissible hearsay, improper other-acts evidence, unsupported expert testimony, or exclusion of relevant defense evidence.

An appellate lawyer examines the evidence, the objection, the court’s explanation, and any offer of proof showing what excluded evidence would have established. A transcript stating only that a witness was not allowed to testify may leave a critical gap.

The error must also be evaluated in context. In People v Nelson, decided March 28, 2025, the Michigan Supreme Court ordered a new trial after considering how exclusion of threat evidence affected the defendant’s self-defense theory, the presentation of the case, and the jury’s assessment of competing accounts. The lesson is not that every exclusion requires reversal. It is that prejudice must be explained using the actual trial.

4. Unconstitutional searches and seizures

A challenged traffic stop, search warrant, home entry, or search of a phone may produce a substantial appellate issue. But “the police searched without permission” is not a complete suppression argument. Counsel must identify the protected interest, the legal justification asserted for the search, and whether an exception or limitation affects suppression.

The Fourth Amendment analysis and the remedy are separate inquiries. A constitutional violation does not invariably require exclusion of every item that followed it. See Herring v United States, 555 US 135 (2009).

The suppression-hearing record may be central. If no motion was filed, further factual development and an ineffective-assistance claim may be necessary. After a guilty plea, counsel must also examine whether and how the issue remains reviewable; one cannot assume every pre-plea suppression issue survives.

5. Involuntary statements and interrogation errors

Confession issues require several separate questions: Was there custodial interrogation? Were Miranda safeguards required and honored? Was a waiver knowing and voluntary? Was the statement coerced?

The interview recording, timing, threats or promises, requests for counsel, and the defendant’s ability to understand may matter. The starting authority for custodial safeguards is Miranda v Arizona, 384 US 436 (1966).

A mental-health condition can be important, but it does not by itself establish that a statement was involuntary under federal due process. Coercive police activity is a necessary predicate to that particular claim. See Colorado v Connelly, 479 US 157, 167 (1986). Competency, waiver, reliability, and coercion should not be collapsed into one argument.

6. Prosecutorial misconduct

Potential problems include improper vouching, burden shifting, inflammatory appeals, or arguments based on facts not in evidence. Context matters: counsel must examine the entire exchange, objections, instructions, and the strength of the remaining evidence.

An isolated phrase should not be assessed as though nothing preceded or followed it. The question is whether the conduct deprived the defendant of a fair trial under the applicable review standard. See People v Unger, 278 Mich App 210 (2008).

For a fuller explanation, see prosecutorial misconduct in Michigan criminal appeals.

7. Suppressed favorable evidence and Brady violations

Undisclosed witness benefits, inconsistent statements, or exculpatory investigative evidence may raise a constitutional disclosure claim. Under People v Chenault, 495 Mich 142, 150–155 (2014), the inquiry concerns government suppression of favorable, material evidence. Favorable evidence includes impeachment information, and materiality must be considered collectively.

Chenault rejected an additional defense-diligence requirement as part of Michigan’s Brady test. That matters because an ordinary newly-discovered-evidence claim and a Brady claim are not interchangeable.

Counsel should establish what existed, who possessed it, what was disclosed, and how timely disclosure could have changed the defense. A generic accusation that police “hid evidence” cannot replace that work. The government’s knowing use of false testimony also raises a related but distinct due-process issue. See Napue v Illinois, 360 US 264 (1959).

8. Incorrect or incomplete jury instructions

The jury must receive the correct legal framework. Possible issues include an omitted element, an incorrect mental-state requirement, or failure to give a supported defense instruction.

Review includes the final instructions, written requests, objections, and any supplemental instructions responding to jury questions. A challenged sentence must be considered within the charge as a whole.

Whether counsel objected—or expressly approved the instructions—can alter the appellate analysis. People v Carines, discussed below, itself involved an unpreserved instructional claim. Identifying inaccurate language is only the beginning; counsel must address preservation and the applicable test for relief.

9. Juror bias, misconduct, or outside influence

Independent internet research, unauthorized communications, or evidence of a juror’s inability to remain impartial may warrant investigation. The relevant materials can include jury selection, juror notes, the judge’s questioning, and admissible evidence of outside influence.

A claim based on extraneous influence requires more than speculation that jurors “must have” relied on something improper. Michigan distinguishes exposure to outside information from ordinary deliberations. See People v Budzyn, 456 Mich 77, 88–89 (1997), applied in this Michigan Court of Appeals opinion.

Juror-testimony restrictions also matter. An attorney should evaluate the lawful method of investigation before anyone attempts to obtain statements from jurors.

10. Confrontation Clause violations

The right to confront prosecution witnesses can be implicated when testimonial statements are introduced without the required opportunity for cross-examination. Subject to recognized exceptions, an unavailable witness’s testimonial statement generally requires a prior opportunity to cross-examine. See Crawford v Washington, 541 US 36, 68 (2004).

The analysis asks what the statement was, why it was made, how it was used, and whether the declarant could be questioned. Not all hearsay is testimonial, and an evidentiary exception does not alone resolve the constitutional question.

Restrictions on meaningful cross-examination can present a separate confrontation issue. Counsel must explain which inquiry was blocked and why it mattered, not merely complain that questioning was limited.

11. Denial of the right to present a defense

A defendant must have a meaningful opportunity to present a defense, although that right does not eliminate legitimate evidentiary requirements. An arbitrary or disproportionate restriction may create a constitutional issue distinct from an ordinary evidentiary dispute. See Holmes v South Carolina, 547 US 319, 324–331 (2006).

Counsel should identify the defense, the evidence excluded, its admissible purpose, and why the restriction undermined the opportunity to present that defense. A supported alternative-suspect theory, for example, calls for different analysis than unsupported speculation about another person.

The offer of proof and the trial court’s reasons often determine whether the appellate record is adequate.

12. Invalid guilty pleas and plea-related advice

A plea does not eliminate every avenue of review. Potential issues include an inaccurate, involuntary, or unknowing plea, a legally significant failure to honor an agreement, or constitutionally deficient advice.

The record should include the plea transcript, agreement, sentencing proceeding, and any competent evidence of advice outside the courtroom. In a claim that deficient advice caused a defendant to plead guilty, prejudice generally requires a reasonable probability that the defendant would otherwise have rejected the plea and insisted on trial. See Hill v Lockhart, 474 US 52, 58–60 (1985).

Regret is not the same as an invalid plea. Nor is plea withdrawal necessarily the safest objective: it can undo negotiated benefits. A sentence-only challenge may present a different strategy. See appealing a guilty plea in Michigan.

13. Sentencing errors and disproportionate sentences

A sentence can be challenged without necessarily attacking the conviction. Counsel may examine guidelines scoring, reliance on inaccurate information, the legality of particular terms, and whether the sentence is proportionate to the offense and offender.

People v Posey, 512 Mich 317 (2023), recognizes appellate proportionality review of within-guidelines sentences, while retaining a rebuttable presumption of proportionality. An above-guidelines sentence is not automatically invalid, and a within-guidelines sentence is not automatically beyond review.

The sentencing transcript, presentence report, scoring materials, objections, and mitigation record should be evaluated together. A persuasive claim explains the particular error or disproportionality rather than simply asking for leniency.

Our Michigan criminal sentence appeal guide discusses these challenges in more detail. Resentencing does not itself erase the conviction or guarantee a shorter sentence.

14. Newly discovered evidence

New evidence may support a request for a new trial, but it ordinarily must be presented through the appropriate trial-court procedure. It cannot simply be attached to an appellate merits brief as though it had been admitted at trial.

People v Cress, 468 Mich 678, 692 (2003), identifies four requirements: the evidence itself must be newly discovered, not cumulative, not reasonably discoverable and producible at trial through diligence, and likely to produce a different result on retrial.

A recently signed affidavit is not necessarily newly discovered evidence. Counsel must determine when the underlying facts became known, what the witness can establish, and how the new material changes the complete evidentiary picture. Recantations, scientific developments, and impeachment evidence require attention to the authorities governing those particular claims.

Our newly discovered evidence guide addresses these distinctions and later decisions in greater depth. An exception allowing a successive motion and the showing required to win relief are separate questions.

15. Cumulative error

Several established errors may interact in a way that deprives a defendant of a fair trial, even where each appears insufficient in isolation. For example, one error might prevent the defense from challenging a witness while another improperly bolsters that same witness.

The argument must identify actual errors and explain their combined prejudice. A long list of rejected allegations does not become persuasive merely because it is labeled “cumulative.” See People v Unger, 278 Mich App 210, 258–259 (2008).

These fifteen categories are not exhaustive. Other cases may involve judicial impartiality, competency, double jeopardy, speedy-trial rights, public-trial rights, or statutory and constitutional issues specific to the offense.

Preservation, standards of review, and prejudice

Preserved, forfeited, and waived are different

A timely, sufficiently specific objection ordinarily gives the trial judge an opportunity to correct an error and preserves the issue. Some claims have different preservation requirements.

Failure to object can result in forfeiture and plain-error review. Intentional relinquishment of a known right—waiver—can extinguish the underlying claim. Counsel must examine what was actually said and done rather than treating all missing objections alike.

Under People v Carines, 460 Mich 750, 763–764 (1999), plain-error review generally requires a clear or obvious error affecting substantial rights, ordinarily the outcome. Relief also depends on the final inquiry concerning actual innocence or the fairness, integrity, or public reputation of the proceedings. A related ineffective-assistance claim has its own requirements; it does not automatically cure a preservation problem.

How much deference does the appellate court give?

Standard	Practical meaning	Typical application
De novo	The legal question is considered independently.	Statutory interpretation or a constitutional legal question.
Clear error	The reviewing court gives deference to factual findings and does not freely retry them.	Findings after a suppression or evidentiary hearing.
Abuse of discretion	The decision is assessed against the range of legally permissible, reasonable outcomes.	Many evidentiary rulings and sentencing decisions.

One issue can involve more than one standard. For example, the facts underlying counsel’s investigation and the constitutional adequacy of counsel’s performance are different inquiries. See Trakhtenberg, 493 Mich at 47.

Harmless error does not mean no error occurred

A reviewing court may recognize a mistake but conclude that it does not justify reversal. For preserved, nonconstitutional error, People v Lukity, 460 Mich 484, 495–496 (1999), places the burden on the defendant to show that the error more probably than not affected the outcome.

For preserved constitutional trial error subject to harmless-error review, the prosecution generally must establish harmlessness beyond a reasonable doubt. See Chapman v California, 386 US 18, 24 (1967).

Certain structural errors are treated differently. Nevertheless, preservation and the procedural route can affect their treatment; “constitutional” does not mean automatic reversal. Counsel must use the standard applicable to the particular claim.

What relief could a successful challenge produce?

Potential issue	Materials commonly needed	Further hearing?	Potential result—not a promise
Insufficient evidence	Trial transcript, exhibits, statutory elements	Usually decided on the trial record	Reversal of the unsupported conviction; retrial for that offense generally barred, with lesser-offense questions evaluated separately.
Ineffective assistance	Record, attorney file, witness or expert evidence	Sometimes an evidentiary/Ginther hearing	New trial, plea-related relief, resentencing, or another tailored remedy.
Evidentiary or confrontation error	Testimony, objections, offers of proof, rulings	Often record-based	New trial if the governing reversal standard is met.
Suppression issue	Warrant, recordings, hearing testimony, findings	Sometimes	Suppression-related proceedings or a new trial; not automatic dismissal.
Jury misconduct	Voir dire, juror notes, competent outside-influence evidence	Sometimes	A hearing or new trial if the legal requirements are satisfied.
Invalid plea	Plea agreement, transcript, advice-related evidence	Sometimes	Plea withdrawal or other appropriate proceedings; charges may remain.
Sentencing error	Sentencing record, PSI, scoring and mitigation materials	Sometimes	Resentencing, correction, or a focused remand.
Newly discovered evidence	New evidence plus the existing record	Often requested, not guaranteed	Further fact-finding or a new trial if relief is established.

The distinction between insufficient evidence and trial error is particularly important. Burks v United States, 437 US 1, 16–18 (1978), explains why reversal for evidentiary insufficiency differs from reversal for a defective trial. The latter ordinarily permits retrial; the former generally bars another attempt to prove the same offense.

A remand can be important without ending the case. An order directing an evidentiary hearing is an opportunity to develop and test a claim, not a finding that the defendant has already proved it.

Direct appeal, factual development, or an MCR 6.500 motion?

The existing record controls what can ordinarily be decided on direct appeal. A claim requiring new testimony may need a trial-court motion or a supported request for remand under MCR 7.211(C)(1). New-trial and plea-withdrawal procedures are addressed in MCR 6.431 and MCR 6.310. Review the applicable Michigan Court Rules.

After ordinary appellate review, an MCR 6.500 motion for relief from judgment may be appropriate. MCR 6.508(D) restricts previously decided claims and claims that could have been raised earlier, subject to its qualifications, including good cause and actual prejudice where required.

MCR 6.502(G) separately limits successive motions. Its exceptions address a qualifying retroactive legal change, new evidence, and certain final orders vacating convictions; it also contains an innocence-based waiver provision and recognizes specified scientific developments as new evidence. These provisions do not automatically establish entitlement to a new trial. Counsel must evaluate both the procedural gateway and the merits.

The filing date matters independently of the strength of the issue. Consult our Michigan criminal appeal deadlines guide promptly. Do not assume that obtaining new documents, contacting a lawyer, or submitting information to a conviction-integrity unit extends a court deadline.

Why “the judge was unfair” is not enough

That concern may identify something worth investigating. It is not yet a developed appellate argument.

Useful review turns the concern into specific questions: Did the judge prevent a supported defense? Apply the wrong rule? Rely on inaccurate information? Restrict cross-examination? Display legally significant partiality?

Then counsel must locate the supporting record and explain the consequence. An adverse ruling can be wrong without establishing judicial bias. A disagreement with a witness can be understandable without establishing legal insufficiency. The strongest argument identifies the precise defect instead of asking the appellate court to accept a general accusation of unfairness.

What record-focused appellate work looks like

The firm’s published case studies describe different kinds of appellate work:

• People v. McClure: three felonious-assault convictions reversed illustrates the importance of comparing the proof with the statutory elements.
• The Gonzalez-Raymundo interpreter-rights case study examines constitutional issues involving interpretation and meaningful participation in a trial.
• The Ricardo Pena appeal and the prosecutor’s confession of error describes James Czarnecki’s work with appellate attorney Gerald Lorence reviewing records and developing issues concerning false testimony and undisclosed proceedings.
• The Mario Smith forensic-pathology investigation shows the work involved in locating and developing missing expert evidence. That expert claim did not ultimately vacate Smith’s conviction; it should not be confused with the separate sentencing litigation.

These matters demonstrate different methods, not a promise that another case will have the same result. Sentencing review likewise requires its own analysis of the hearing, guidelines, and reasons for the sentence; it should not be advertised as a successful case result without an actual, documented disposition.

What should you provide for an appellate evaluation?

Start with the judgment of sentence, case number, court, sentencing date, and all prior appellate decisions. Identify whether the conviction followed a trial or plea and whether an appeal is already pending.

Additional materials may include:

• Trial, plea, sentencing, and motion-hearing transcripts.
• Prior briefs, motions, orders, and post-conviction filings.
• Relevant exhibits, discovery, and the prior attorney’s file.
• The presentence report and guidelines materials, transmitted securely.
• New affidavits, expert reports, and an explanation of when the information became available.

A short chronology and specific concerns are useful. They assist the review; they do not replace the record. Use a secure method requested by counsel for sensitive documents rather than placing confidential material into a public comment or general website form.

Frequently asked questions

What are the strongest grounds for a criminal appeal in Michigan?

There is no universally strongest ground. A narrow statutory issue can be stronger than several broad constitutional allegations. The best claim fits the record, controlling law, preservation rules, and the remedy being sought.

Can I appeal because a witness lied?

Possibly, but a credibility disagreement alone is usually insufficient. Counsel must determine whether the issue involves suppressed impeachment evidence, knowing use of false testimony, improper limits on cross-examination, or newly discovered evidence.

What if my lawyer did not object?

The issue may be subject to plain-error review. A supported ineffective-assistance claim may also be available, but it requires its own performance and prejudice analysis. Express waiver presents an additional issue.

Can I introduce new evidence directly in the Court of Appeals?

Ordinarily, an appeal reviews the existing record. Additional evidence may need to be developed in the trial court through an appropriate motion or remand procedure. Attaching it to a brief does not automatically make it part of the trial record.

Does winning an appeal mean immediate release?

Not necessarily. Relief can mean a new trial, resentencing, or further proceedings. The court’s order, remaining convictions, custody status, and other circumstances determine what happens next.

Can I challenge my sentence without withdrawing my plea?

Potentially. A sentencing challenge and a plea-withdrawal request pursue different objectives. Counsel should examine the agreement and the specific claim before recommending either course.

Do I have to prove actual innocence to win an appeal?

Not in every case. A legally sufficient challenge may concern an unfair trial, an invalid plea, or an unlawful sentence. The necessary showing depends on the claim and procedural posture; post-conviction innocence provisions have their own requirements.

Should every possible issue go into the brief?

Not necessarily. Counsel should investigate potential issues broadly and select arguments carefully. A concise, well-supported claim is more useful than an accusation that cannot be established or connected to relief.

Discuss a Michigan conviction or sentence with appellate counsel

An effective appeal begins with independent judgment about what happened, what the law requires, and what relief remains available.

Czarnecki & Taylor PLLC represents clients in Michigan criminal appeals and post-conviction matters. To discuss a potential case, call (586) 718-2345 or contact Czarnecki & Taylor PLLC about a criminal appeal. Provide the court, case number, sentencing date, and any known deadline when you contact the office.

This article provides general legal information, not advice about any particular case. Reading it or contacting the firm does not by itself establish an attorney-client relationship. Deadlines and available remedies depend on the individual record and procedural history. Past results do not guarantee future outcomes.