Hip flask defence

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In places like the United Kingdom, a hip flask defence is a defence to an allegation of drunk driving that a driver had consumed alcohol between the time of a vehicular offence, such as an accident, and a breathalyser test, so that a positive result does not actually indicate that they were driving while intoxicated.[citation needed]

Though popular (in 1991, the defence was used in 90% of Swedish appeals against drink driving convictions),[1] the hip flask defence is not always effective. It is possible to back calculate the amount of alcohol and prove an offence nevertheless.[2]


  1. ^ Jones, AW (July 1991). "Top ten defence challenges among drinking drivers in Sweden". Medicine, Science, and the Law. 31 (3): 229–38. PMID 1822585.
  2. ^ Iffland, R; AW Jones (2002). "Evaluating alleged drinking after driving: the hip-flask defence: Part 1. Double blood samples and urine-to-blood alcohol relationship". Medicine, Science, and the Law. 42 (3): 207–224. Retrieved 25 April 2009.

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