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Call to reform drug driving laws as study shows impairment lasts hours

Researchers at the University of Sydney say drug driving laws are “out of date” and should reflect the results of a new study that found impairment after taking cannabis lasted about three to 10 hours.


But the NSW government has dismissed those calls and defended its zero tolerance approach to drug driving, with tests that can pick up traces of the drug weeks after consumption.

Drivers who use cannabis can be prosecution on the basis of the presence of THC in their blood or saliva. CREDIT: FILE IMAGE / QUEENSLAND POLICE SERVICE Danielle McCartney, clinical research associate at Sydney University’s Lambert Initiative for Cannabinoid Therapeutics, said a person coul