LUHE
specifically, what did he do wrong?
Mistakes in order:
#1 Nazario's temporary vehicle license was visible in the lower right hand corner of his rear window even in the body cam video, which wasn't even at a good angle to see it. The police may not have seen it in the dark, but once he pulled into a brightly lit gas station, proper procedure would have been to check for and run that tag.
#2 The imperatives shouted at Nazario were conflicting. He was simultaneously told to keep his hands visible and to get out of the vehicle which would have involved pulling a hand inside the vehicle which would very likely have gottem him shot.
#3 Use of force by police must be justified by the level of threat. A suspect may be noncompliant for a whole spectrum of reasons ranging from impairment/confusion/fear on one end to open hostility on the other. It's one thing if a suspect is surely and combative, but it's quite another if he is holding his hands up and stating that he's afraid. Proper procedure is to make that determination and not needlessly escalate a traffic stop.
None of this is my personal opinion. This is what use of force experts across the country have said after reviewing the recordings, which is why Gutierrez was fired.
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Was the police stop in the video you posted, in fact, illegal?
No it was not. It's awkward to pull over your boss's boss's boss's boss and not be able to give a good reason for it, but it was not illegal.
Both vehicles in the video (The police cruiser and the white Ford sedan) were owned by the state and running the plates on either one would have returned a null result. The officer may not have realized that at first, but once she identified herself as one of the top law enforcement officials in the state, the reason became crystal clear and the officer going off about the factory tint on her state owned vehicle is pure bullshit.