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Nobody would want a blood test for a routine check though…I was thinking more along the lines of another blowing apparatus, that could measure the amount of THC in a sustained breath.They already have a tool that measures the amount of THC in your system, its called a routine blood test.
As for dating THC in the blood:
I'm not too positive the inner workings but I think a specialized light (LASER) is refracted using a specimen slide and the refracted light can give the tech an idea of how long the TCH molecules(?) have been stored in the fat based on color and decay rate...i.e...older TCH cells(?) will be in the throws of cellular degradation vs new ones that are "plump" and "intact." This is only my supposition and I could be totally wrong.
Usually someone popped for DUI with weed in their system is 90% drunk as well, so most are easy cases to prove and the defendant/s usually plead out. This has been a huge boon for the state of Washington. DUI is an industry here.
They don’t actively test anyone here in Australia if it isn’t obvious (smell, bloodshot eyes etc) or 90% of the blue collar workers would be booked and off the road. Lol