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DUI Defense Resource

Breath & Blood Tests

Challenging breathalyzer results and forensic blood tests.

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.

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Disclaimer: Laws differ by state and change over time. Always consult a licensed attorney in your jurisdiction.