That's how alcohol breathalysers work here - if it looks like you're over the legal limit you get a second, more sophisticated test. If you're way over whateve

That's how alcohol breathalysers work here - if it looks like you're over the legal limit you get a second, more sophisticated test. If you're way over whatever limit they decide for THC then it shouldn't matter if you have a prescription - a medical need doesn't make you a better driver while under the influence. But I agree with what you're saying - it's not the tool that is problematic here, but the laws that go around it. A beer yesterday seems OK. Driving tipsy is generally accepted (except in Oz in the case of novice/probationary drivers) but considering the high correlation between alcohol and driving impairment, I think it's more a testament to the alcohol lobby's strength that even a little drink driving is considered reasonable. Drinking alcohol is/should be a recreational activity, not a human right.