The Presence of Medication Does Not Answer the Impairment Question
Pain medication, sleep aids, muscle relaxants, anxiety medication, and other prescriptions can affect alertness or coordination. But a detected drug or a valid prescription does not automatically establish that the person was impaired while operating.
Wisconsin can pursue different drug-driving theories. The exact substance, prescription status, metabolite, concentration, statutory category, and observed conduct matter.
Police Observations and DRE Evidence
Officers may rely on driving, speech, pupils, coordination, statements, field testing, and a Drug Recognition Evaluation.
- Compare observations with body-camera and dash-camera footage
- Review the DRE protocol and conclusions
- Identify medical explanations for claimed signs
Medical and Prescription Records
The defense may use prescribing history, dosage, compliance, tolerance, diagnosis, and physician information to explain the medication and its expected effects.
- Confirm the valid prescription and pharmacy history
- Document stable long-term use or recent dosage changes
- Review warnings, interactions, and dose timing
Blood and Toxicology Evidence
A blood result can show a drug or metabolite without automatically proving impairment. Method, timing, concentration, pharmacology, and interpretation should be reviewed.
- Request complete toxicology discovery
- Distinguish active drug from metabolites
- Evaluate drug interactions and timing
