Are breath test results admissible in court?

• A. No, breath tests are never admissible.
• B. Admissible only if administered by a supervisor.
• C. Only admissible if the suspect agrees.
• D. Yes, when properly administered with valid calibration, maintenance, and chain-of-custody documentation.

Answer: (D)

Breath test results are admissible in court when the test is properly administered with a device that has valid calibration and maintenance, and there is complete chain-of-custody documentation. The key idea is reliability: the device must be within its calibration range, regularly serviced, and operated according to established procedures. Calibration checks verify the device’s readings against known standards; maintenance keeps the instrument functioning within specifications; and chain-of-custody records show who handled the sample, when, and that nothing was altered or tampered with from collection to presentation in court. When these safeguards are in place, the evidence is considered scientifically trustworthy and can be used in court. The other options miss crucial safeguards—admissibility does not depend on a supervisor’s involvement, the suspect’s agreement, or an absolute ban—it depends on proper procedure, calibration, maintenance, and a solid chain of custody.