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原文传递 ANALYTICAL AND PHYSIOLOGICAL SPECIFICITY ISSUES IN BREATH ALCOHOL ANALYSIS.

题名：	ANALYTICAL AND PHYSIOLOGICAL SPECIFICITY ISSUES IN BREATH ALCOHOL ANALYSIS.
作者：	WILLIAMS-PM (LION LABORATORIES PLC)
关键词：	BREATH-TEST; 1542-; DRUNKENNESS-; 1783-; POLICE-; 1522-; LEGISLATION-; 1556-; UNITED-KINGDOM; 8119-; CONFERENCE-; 8525-
摘要：	Drink-drivers frequently allege that their breath alcohol reading was so high because some non-ethanolic chemical was in their breath at the time of the test. This paper reviews the author's experiences and methodology in dealing with such matters. Conceivable sources of breath contaminants are ingestion (with food, medication or smoking), endogenous production and occupational or environmental exposure. Under British Law the prosecution have only to prove that at the time of the test the subject's breath alcohol level (BrAC) exceeded the per se limit: it is not required to prove the actual concentration which at that time existed. The forensic scientist should therefore consider the following questions, in this order: (a) is the alleged interfering substance 'X' volatile? (b) does the analyser used measure 'X' at all? (c) what is the analyser's relative response between 'X' and ethanol? (d) what maximum breath level of 'X' could the driver have had? (e) could this have elevated the reading by the difference between the per se level and that recorded by the instrument? In most instances the case is solved well before question 'e' is asked. New analytical specificity requirements, such as those of OIML, while physiologically unjustified, should help reduce spurious defence claims at source. (a) For the record of the covering entry of this conference, please see IRRD abstract no 868581.
总页数：	ALCOHOL, DRUGS AND TRAFFIC SAFETY - T'95, 13 AUGUST - 18 AUGUST 1995
报告类型：	科技报告