For instance any amount of THC in the blood can get an impaired driving charge. Unless it is a legalized state in which case it minuscule tiny amount that could have resulted from smoking 14 week days ago is still enough.

Sure, that’s just the law.

With the smallest amounts, one nanogram per milliliter, false positives are as high as 40%, but when they go into court they don’t say that.

I don’t think the lab techs attend the court cases to provide details about how testing works…

If you know that, you don’t think a decent defense lawyer knows that?

What I asked for was a source for your bold claim that:

drug testing Labs try to give the results the cops want.

Interesting that you’d downvote me just for asking for a source for your strong claim though…