Research library
DUI Evidence and Test Guides
Evidence pages help readers organize what happened and which records to ask counsel about.
Last reviewed: July 6, 2026
Vehicle StopWhy the officer made contact and what facts were documented.Reasonable SuspicionSpecific facts used to justify a brief detention.Probable CauseFacts used to justify arrest, search, or test request.Field Sobriety TestsRoadside exercises, instructions, and officer notes.Horizontal Gaze NystagmusEye-movement observations and administration issues.Walk And Turn TestInstructions, surface, footwear, and physical limitations.One Leg Stand TestBalance, timing, medical conditions, and officer scoring.Breath TestMachine use, timing, calibration, and observation period.Blood TestDraw timing, lab handling, and chain of custody.Urine TestDrug allegations, timing, and interpretation limits.Refusal EvidenceWarnings, paperwork, and whether a refusal occurred.Implied ConsentLicense consequences and chemical-test warnings.Calibration RecordsMachine logs, maintenance, and testing reliability.Maintenance LogsDevice upkeep and records requested in discovery.Officer ReportObservations, timeline, statements, and omissions.Dash CameraVideo review, audio, timing, and officer statements.Body CameraRoadside interaction, instructions, and consent issues.Witness StatementsPassengers, bystanders, bartenders, and other observers.Medical ConditionsBalance, eyes, diabetes, anxiety, injury, and fatigue.Rising BACTesting delay and alcohol absorption questions.Mouth AlcoholBurping, dental work, mouthwash, and observation issues.Observation PeriodPre-test waiting time and officer compliance.Chain Of CustodyBlood tube handling, storage, and lab transfer.Lab ReportTesting method, analyst notes, and result review.Drug Recognition EvaluationDrug-impaired allegations and officer training.Search And SeizureVehicle search, phone search, and property review.Miranda WarningsCustody, interrogation, and statements.Checkpoint ProceduresNeutral plan, supervision, and stop sequence.Crash ReconstructionTimeline, impact, and causation questions.Prescription RecordsLawful medication and warning-label issues.Marijuana TestThc result limits and impairment proof.Portable Breath TestRoadside screening device and admissibility questions.Independent Blood TestDefense testing rights and timing.Suppression MotionAsking the court to exclude evidence.Administrative Hearing EvidenceLicense hearing documents and deadlines.Booking RecordsJail intake, property, timing, and release conditions.Court DocketHearings, filings, warrants, and case status.License NoticePaperwork tied to suspension or restricted driving.Plea Offer ReviewTerms, consequences, and alternatives.Trial Exhibit ReviewDocuments, videos, test results, and witnesses.Expert WitnessToxicology, lab, accident, or police-procedure review.Officer Training RecordsCertification, procedures, and testimony.