SkillsLib.ai

DUI/DWI Defense Case Analyzer

Identify prosecutorial weaknesses and procedural violations in DUI cases

3.3(3 reviews)
10+ downloads
Updated Oct 2026

What You Can Do

You can upload police reports, breath/blood test results, field sobriety test documentation, and discovery materials to receive a comprehensive case analysis. The skill systematically identifies procedural violations, contradictions in witness statements, gaps in evidence chain of custody, and constitutional violations that may support suppression motions or negotiation leverage. It highlights specific test administration errors, credibility issues with law enforcement witnesses, and prosecutorial weaknesses tied to relevant case law.

Features

Police Report Deconstruction

Extracts and flags inconsistencies, timeline gaps, and unsupported conclusions in arrest narratives and supplemental reports

Breathalyzer Protocol Analysis

Evaluates compliance with breath test administration protocols, calibration records, and maintenance logs to identify basis for exclusion

Field Sobriety Test (FST) Critique

Analyzes NHTSA-approved test administration, environmental factors, officer training certifications, and scientific validity of performance conclusions

Fourth Amendment Violation Detection

Identifies unlawful traffic stops, warrantless searches, blood draws without consent, and Miranda violations supporting suppression arguments

Evidence Chain of Custody Review

Flags breaks, gaps, or improper handling in evidence documentation that could render samples inadmissible

Witness Credibility Assessment

Evaluates officer testimony reliability, training adequacy, prior discipline records, and bias indicators based on report language and facts

Defense Strategy Recommendations

Suggests suppression motions, cross-examination angles, expert witness needs, and negotiation talking points based on identified weaknesses

Example Output

Case Analysis: Officer Inconsistencies

The officer stated defendant showed "pronounced nystagmus" on HGN test but later noted "eyes appeared clear and alert" in supplemental report — direct contradiction undermining sobriety conclusions.

Breathalyzer Issue Identified

No calibration records provided for testing device in past 60 days. Protocol requires calibration every 10 days. This gap provides grounds for exclusion of breath results under [State] evidentiary rules.

Stop Legality Concern

Officer states "weaving within lane" as traffic violation basis, but dash cam (Exhibit B) shows vehicle maintained consistent lane position. Stop may be pretextual — consider Fourth Amendment suppression motion.

Recommended Actions

  • File discovery motion for officer's FST training certification
  • Retain toxicology expert to challenge BAC results
  • Propound interrogatories on prior breath machine malfunctions
  • Explore plea negotiation given procedural vulnerabilities

What's Included

  • Violation Checklist: Structured checklist of 30+ common DUI procedural violations, constitutional issues, and test administration errors to verify against your case facts
  • Police Report Template: Reusable prompt structure for submitting police reports, discovery docs, and test results in optimal format for analysis
  • Cross-Examination Guide: Officer deposition and trial cross-examination suggestions based on identified weaknesses and contradictions in their statements
  • Motion Language Library: Template language for suppression motions, discovery requests, and Batson challenges derived from your specific case facts
  • Evidence Summary: One-page prosecution vs. defense evidence comparison highlighting your case strengths and vulnerabilities for case planning

Who It's For

  • Criminal defense attorneys
  • Public defenders and legal aid attorneys
  • DUI/DWI specialist counsel
  • Paralegals and case managers
  • Solo practitioners and small law firms

Best For

  • Pre-trial DUI case strategy development
  • Identifying suppression motion opportunities
  • Building cross-examination questions
  • Plea negotiation preparation
  • Expert witness identification and scope

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