Claude AI for Criminal Defense: Case Prep & Motion Drafting

AI in Criminal Defense: A Practical Guide

Criminal defense demands speed. Court deadlines are rigid, discovery productions are massive, and clients need answers now. Claude handles research and first drafts, freeing time for strategy, counseling, and courtroom prep.

This guide covers case analysis, motion drafting, plea negotiation prep, and sentencing research — each with prompts you can use immediately.

Case Theory Development

Every defense starts with a theory. Claude helps you evaluate multiple theories against the evidence before committing to one.

Based on the following case facts, identify and evaluate potential defense theories:

Charges: [LIST ALL CHARGES]
Prosecution's theory: [SUMMARIZE THEIR CASE]
Key prosecution evidence: [LIST EVIDENCE]
Key defense evidence: [LIST EVIDENCE]
Client's account: [SUMMARY — no privileged strategy]

For each viable defense theory:
1. State the theory clearly
2. Which elements of the charge it attacks
3. Supporting evidence from the case file
4. Weaknesses and how to address them
5. Jury appeal — does it make common-sense?
6. Viability rating: strong / moderate / weak

Start with Claude's analysis. Test each theory against the evidence and your trial experience.

Suppression Motion Drafting

Suppression motions are formulaic in structure but fact-intensive in argument. Claude drafts the framework; you add the case-specific facts and local authority.

Draft a motion to suppress based on the following:

Court: [COURT]
Case: [CASE NUMBER]
Evidence to suppress: [DESCRIBE THE EVIDENCE]
Constitutional basis: [Fourth Amendment / Fifth Amendment / Sixth Amendment]
Facts of the encounter: [WHAT HAPPENED WITH LAW ENFORCEMENT]
Relevant cases: [ANY SPECIFIC AUTHORITY]

Structure:
1. Introduction and relief requested
2. Statement of facts
3. Legal standard for suppression
4. Argument — why the evidence was obtained unconstitutionally
5. Prejudice — why the evidence matters to the prosecution's case
6. Conclusion with specific relief requested

Cite authority in Bluebook format. Every factual assertion should reference the record.

For tips on writing effective legal prompts, see our legal prompt writing guide.

Discovery Review

Criminal discovery can run thousands of pages. Claude organizes evidence, flags exculpatory material, and identifies inconsistencies.

Review the following discovery materials and identify:

1. Statements from witnesses — summarize each witness's account
2. Inconsistencies between witness statements
3. Potential Brady/Giglio material — anything favorable to the defense
4. Chain of custody issues with physical evidence
5. Gaps in the investigation — what wasn't done that should have been
6. Impeachment material for prosecution witnesses

Discovery materials:
[PASTE RELEVANT PORTIONS]

Process discovery in batches by type: police reports first, then witness statements, then forensic reports. This produces more focused analysis.

Plea Negotiation Preparation

Effective plea negotiations require knowing the sentencing landscape. Claude researches guidelines, mandatory minimums, and departure factors.

Research sentencing considerations for the following case:

Charges: [LIST CHARGES WITH STATUTES]
Jurisdiction: [FEDERAL / STATE]
Client's criminal history: [PRIOR RECORD SUMMARY]
Guideline range (if known): [RANGE]

Provide:
1. Statutory sentencing range for each charge
2. Mandatory minimums that apply
3. Available departures or variances
4. Factors that support a below-guidelines sentence
5. Comparable cases with similar sentences
6. Collateral consequences (immigration, employment, licensing)
7. Plea options that minimize exposure

Sentencing Memoranda

Sentencing advocacy requires humanizing your client. Claude structures the memorandum; you supply the personal details and mitigation evidence.

Outline a sentencing memorandum:

Offense: [CHARGE AND CONVICTION]
Guidelines range: [IF APPLICABLE]
Requested sentence: [YOUR RECOMMENDATION]
Mitigating factors: [LIST — childhood, mental health, rehabilitation, employment, family]

Structure:
1. Introduction and sentencing request
2. Offense conduct — from the defense perspective
3. Personal history — relevant background
4. Mitigation — organized by factor
5. Comparable sentences in similar cases
6. Proposed conditions and rehabilitation plan
7. Conclusion

Ethics and Confidentiality

Criminal defense work involves sensitive, privileged information. When using Claude:

• Never include client-identifying information in prompts
• Review all output for accuracy — AI cannot replace your professional judgment
• Do not rely on Claude for case citations without independent verification
• Use Claude for structure and research direction, not as a substitute for legal analysis

Read more in our ABA ethics and AI guide.

Explore more criminal defense prompts on our criminal defense practice area page.