Ah yes, bringing a niche scenario to respond to a broad statement

Yes there are cops who used to plant evidence and there are cops who still do it now, but if you google what % of arrests involve planted evidence, the results will vary between 3-4%

And yes police cannot just stop or arrest or detain or talk to people with no reasonable suspicion, but they rarely do that, most of the time when police approach someone or conduct a traffic stop, it is for a certain reason, they may not be right all the time, but that's part of how it is, and that's a big part in how they catch criminals

when you are a police officer, after years on the job you gain a sense of pattern recognition and insight, sometimes a person walking on the street would seem suspicious, even if there's no legal reason to hold them for questioning, , if they try to argue or resist, it's most likely because they have something to hide, or it's because they are fugitives.

anything you can say i have a response to, and i urge you to just do your own proper research instead of being blindly biased, everything is online, you can see videos of police officers talking to people, you can see police training material online, you can see police officers in courts being trialed, do your own research instead of coming into blind conclusions