Just this week a bodycam from NYC officer shows him planting drugs over 2 years ago. The person who's involved took a plea deal because they didn't want to risk going to jail for many years. The cop still has his job and this wasn't the first time.
Try getting a job in the US with a criminal record.
Overall I agree though. This is the same baseless defense used against leaking of info on war crimes.
I doubt planting evidence is common, but it will nevertheless be interesting to dig through that. If it is true the cop is still serving, it should be a huge scandal. These practices need to be stomped out immediately.
One of the reasons that the protests in the US are so widespread right now is that, fundamentally, this is the issue: that cop still serving isn't a scandal at all. The police look out for their own, and internal accountability for violating procedure is an absolute farce.