EXCLUSIVE: Patients prescribed CBD-only medication are unlikely to test positive for THC during random roadside drug testing, a new study has found, in a welcome development that will bring some comfort to anxious medicinal cannabis users.

Research led by the Lambert Initiative concluded that devices used by police in Australia will not mistake CBD for THC, as had been feared.

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It will ease the worry among motorists that they risk being wrongly hauled before the courts.

Roadside tests are unlikely to mistake CBD for THC, the study found

The peer-reviewed study was conducted amid concern that roadside testing devices may confuse CBD for THC due to the similarities between the cannabinoids.

Around 25% of medicinal cannabis patients in Australia take CBD only.  

 “We were interested in answering this question because THC and CBD have somewhat similar chemical structures and this could lead to CBD being mistakenly identified as THC on these tests,” Lambert Initiative clinical research associate and lead author Danielle McCartney said.

“This is important because while THC is intoxicating and prohibited among drivers, CBD is not.”

The study used two oral fluid testing devices, Securetec DrugWipe (DW-5S) and Drager Drug Test 5000 (DT5000), that are often used in roadside testing.