Police decide who ingested exactly which drugs based on a 12-step collection of clues gathered by staring into suspects’ eyes, pinching their muscles, taking their blood pressure and watching closely how they walk and talk and balance.
One of the biggest culture shocks as a Danish person visiting California, was seeing how normalised driving high was. I smoke pretty regularly, but I would never even think about getting behind the wheel after a single puff.
I agree with you people shouldn't, but this is about our police being able to do whatever they want and ruining lives purely based on their intuition, which is frequently wrong and unriable at best.