It's 5pm on a weekday in Guildford, Surrey. For an hour, members of Surrey Police's Vanguard Road Safety team have been stopping motorists to warn them about the dangers of driving under the influence of drink and drugs, when they strike 'lucky' and nab a drug-driver. Clues?
His car reeks of cannabis and there's a box of the stuff on his dashboard. The driver's saliva is found to contain illegal levels of THC, the psychoactive component of cannabis, set at two micrograms per litre of blood. In light users, THC can remain in the blood for up to seven hours, but in heavier users it's at least 24 hours. Some users constantly microdose, so the drug never leaves their system.
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