One thing hinted at in the article is the risk of harm to "innocent"[1] drivers from drivers carrying drugs who are distracted by the large scary yellow signs, and thus driving while distracted.
> Peters said the officer asked him what kind of drugs he had in the car, saying it would be much easier to confess before other officers and a drug-sniffing dog arrived. Peters insisted he had no drugs. As promised, other officers and the dog were summoned, and Peters agreed to allow his car to be searched.
I'm not a lawyer, but as I understand it you shouldn't agree to be searched. What's the current best practice for this?
[1] using the words of law enforcement to emphasise the point.