Cannabix Technologies Inc (BLOZF)

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Why Is It So Hard To Test Whether Drivers Are Stoned?

But daily users are different. Huestis says that heavy smokers build up so much THC in their body fat that it could continue leaching out for weeks after they last smoked. These chronic, frequent users will also experience a rapid loss of THC from their blood after smoking, but they will also have a constant, moderate level of blood THC even when they're not high, Huestis says.

http://www.npr.org/sections/health-shots/2016/02/09/466147956/why-its-so-hard-to-make-a-solid-test-for-driving-while-stoned