[SannTek]

Good question.

Our current device only screens to see if you used cannabis in the last 2-4 hours (which aligns with the approximate window of impairment for cannabis). It does not actually assign a degree of impairment to a particular concentration (ie if our device returns a higher concentration, it does not necessarily more impaired).

This is actually good for chronic users. In all our tests, both frequent and infrequent users had no detectable trace of THC left in their breath 3 hours after consumption. Therefore, our test does not discriminate between frequent and infrequent users in the same way blood does.