They claimed that they announced themselves which suggests that they didn't know that the warrant they were serving was no-knock.

Their shots apparently hit the apartment above. With a breaching entry and an unknown target, random positioning in the horizontal plane may be expected but in the vertical plane it is definitely not. That suggests that they were holstered when they kicked in the door. Further, the gunner shot once and hit while the "police" shot many times and only managed to hit his girlfriend which suggests that they were much more panicked than someone that was asleep 1 minute before the encounter started.

what does the evidence look like when the police decided to rob you?

Evidence looks like the police came in unprofessionally, unprepared, and embarrassed. This is not excusable. They are lucky more lives weren’t lost.

Wow. I did not realize the other apartment was located above. I thought it was next door.

Just, wow.

There's the stat that the police take more in civil forfeiture than all burglaries, but that's the "perfectly legal" theft by police. Invisible theft by police - seizing drugs or money and then not registering them as evidence but instead taking themselves - is almost impossible to quantify, since it happens under strong omerta.

>is there a reason to believe that might be a possible scenario here?

It is not unheard of for drug task forces to augment their official income by robbing drug dealers. I wanna say one of the major cities in CA had a task force that got into trouble for this as did IIRC Newark and Baltimore (pretty sure it was them but not 100%). It's definitely A Thing(TM). There was at least one story of a particularity systemic case that hit HN.

Yep in Baltimore the Guns Task Force was robbing drug dealers and then reselling the drugs. You can read more about it here: http://data.baltimoresun.com/news/gun-trace-overview/