> wouldn't they normally bring drugs with them to plant?

Why do you think they were so annoyed at all the cameras?

I guess they assumed that a musician whose whole persona is built around weed would supply the evidence.

> Common enough to be a minor plot point in a current cop show...

You've reversed cause and effect. Cop shows don't base their plots on what is real, they base them on what people will believe is plausible.

You say that, but I’ve been watching a lot of those body cam channels over the past few years.

I remember one quite well, in which the police were raiding some suburban Texas home and decided to steal the guns and cocaine they found in it.

The kicker: They forgot to turn off their body cams while doing and discussing it.