Modern police DUI checkpoints rely on a two-stage testing approach. Officers first use a passive or preliminary breath tester (PBT) to screen drivers quickly. Those who fail the initial screening are then subjected to an evidential breath test using a certified fuel cell analyzer.
The evidential device — like the AlcoBreath PRO-800 — produces a printed or digitally logged result that is legally admissible in court. These devices undergo regular calibration using certified gas standards to ensure accuracy is maintained.
Data logging capabilities also allow police departments to maintain comprehensive records of all tests conducted, supporting prosecution and department compliance audits.
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