It is also possible that so-called “hard core” drink-drivers and recidivist drink-drivers may be impervious
to the setting of BAC limits. Studies conducted in the United States and Canada (Simpson et
al.,1996; Mayhew et al., 199
found that 65% of all drinking driver fatalities and 72% of all tested
fatally injured drinking pedestrians had BACs over 1.5 mg/ml. This is almost twice the established
level in much of Canada and the USA, suggesting that these individuals might pay little attention to
a further tightening of the level. In addition, over 20% of all convicted drink-driving offenders have
prior drink-driving offenses. Such disregard for the established limit calls into doubt the efficiency
of minor changes to the permitted BAC level, at least for these groups of drivers.
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