RE:RE:they run this up big time on news to $3.50 in 2 daysSome here are old enough to remember the "Blow Bus" . When driving while impated first came out the holiday road blocks first appeared with the Blow Bus parked along side the police cars.
The authorities will need something beyond just THC in your system as that can stay for long periods. Maybe they have to start with cannabis blow vans and work to hand held such as alcohol breathalizers did.