I remember when someone was prosecuted for a drug offense because their money was contaminated by cocaine... but it turns out 3/4 of currency is already contami

I remember when someone was prosecuted for a drug offense because their money was contaminated by cocaine... but it turns out 3/4 of currency is already contaminated: https://en.wikipedia.org/wiki/Contaminated_currency https://en.wikipedia.org/wiki/Contaminated_currency I wonder because it might be many people have THC in their blood for days, and it might not indicate what the prosecution infers. (I think thc lasts longer than say alcohol)