Cannabix Technologies Inc (BLOZF)

[medchem]

They haven't proved anything. in fact they state that they cannot do it for people who just smoked:

The ability to detect THC and its metabolites in human breath is a significant scientific breakthrough that allows for real-time pharmacokinetic analysis. Such analysis provides a method for the identification of frequent users of marijuana who tend to retain THC in their body for longer periods of time, relative to infrequent marijuana users who tend to clear THC from their body more quickly.