"When you see on the news that Police randomly stopped a car and discovered a huge cache of drugs... you don't actually think that's random, do you?"
TBH I had never thought about it before but now I recognize this pattern everywhere.
If you "did nothing wrong", you also drive like you did nothing wrong (5-10 over), hit some yellow lights, etc.
If you know you have a bag of drugs in your car, and a police vehicle pulls at a stop next to you, you can panic.
Also if they do stop you, becase you (eg.) didnt use your turn signal, most people just sigh., give some excuse ("I wanted to, but that black car came, and i had to go around, and the cat, and the wipers, and this and that"), and calmly wait for a ticket... people with drugs usually act different.
And thirdly, police usually know all the drug dealers in their area, know their cars, and just have to catch them with enough drugs to make it worthwile.... so they probably get stopped a bit more often than a normal random commuter does, even if neither of them use turn signals regularly.
https://www.reuters.com/article/us-dea-sod-idUSBRE97409R2013...
https://www.deamuseum.org/wp-content/uploads/2015/08/042215-...
Oh, it definitly happens.
But officers also make fishing stops all the time too.