Proposed drug-drive thresholds for prosecution (microgram per litre of blood/ µg/L). A microgram is 1 millionth of a gram.
Drug Level which triggers drug-drive prosecution
Illegal drugs ‘Zero tolerance’ trace threshold in blood
Cannabis
(active ingredient Tetrahydrocannibol or THC) 2 micrograms per litre
Cocaine 10 micrograms per litre
BZE benzoylecgonine
(main breakdown product of cocaine) 50 micrograms per litre Methamphetamine 10 micrograms per litre
‘Ecstasy’ (MDMA)
(illicit drug linked to ‘clubbing’) 10 micrograms per litre
Ketamine
(anaesthetic misused in ‘clubbing’) 20 micrograms per litre
LSD (Lysergic Acid Diethylamide) 1 microgram per litre
Heroin- 6-monoacetylmorphine
(6-MAM - heroin and diamorphine) 5 micrograms per litre
Amphetamine To be decided
(illicit drug also prescribed for treatment of Attention Deficit and Hyperactivity Disorder)