The Intoximeter 3000 and the four minute fallacy.
Claims that breath alcohol values measured on the Lion Intoximeter 3000 are invalid if the machine clock is incorrect by more than four minutes have been shown to be technically incorrect. A study involving measurement of simulated breath alcohol levels with various Intoximeter 3000 clock times shows no variation within normal tolerances for breath alcohol values.
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D000435:Alcoholic Intoxication / Q000175:diagnosis*; D001944:Breath Tests / Q000295:instrumentation*; D004868:Equipment Failure; D006801:Humans; D015203:Reproducibility of Results; D013997:Time Factors