Breath and blood testing
Breath devices require calibration and a continuous observation period. Blood draws raise chain‑of‑custody and lab methodology issues, including fermentation, preservatives, and GC/MS protocols.
Common challenges
- Improper observation period
- Instrument maintenance gaps
- Medical conditions (GERD, diabetes)
- Contaminated or mishandled blood vials
Your lawyer can subpoena maintenance records and lab documentation to evaluate reliability.
Disclaimer: Laws differ by state and change over time. Always consult a licensed attorney in your jurisdiction.