Hopefully some of the tax revenue is going into research on marijuana as well, if we hadn't basically banned research on this substance for so long we'd have mo

Hopefully some of the tax revenue is going into research on marijuana as well, if we hadn't basically banned research on this substance for so long we'd have more data. However, can't the officer give a field sobriety test if they suspect the citizen is high? What would they do if someone took too many xanax or went on a drive while on ambien? While I understand why a "highness-measuring" device would be nice, I think this underlies a sore point in our policing and governing. It's not enough for the officer to make a judgement on whether the citizen is too impaired to drive, we must have a quantitative measurement. I think both a subjective judgement and any one quantitative measurement can overlook a ton of factors, but one is better at negating legal repercussions.