Comment by sejje
...many people get off because of police procedure problems.
I see it constantly in my courtroom youtube feeds. Judge: "And what was the probable cause?"
Prosecutor: "(some bullshit that's not legit PC)"
Judge: ::incredulous look:: "Mr. Criminal, I'm going to dismiss this case based on lack of probable cause. I suggest you take this opportunity to fix your problems and stay out of my courtroom...blah blah blah"
The smaller the crime (like obstruction, not exactly murder or anything), the more likely it works. I think because police often use small crimes as retaliation.
There's no mountain-sized barrier, you just have your attorney bring up probable cause with the judge.
This only works for excluding evidence acquired illegally. Cases are not dismissed based on lack of probable cause. You also cannot exclude the person even if the method of their arrest was illegal. Watching some court room feeds online doesn't actually teach you meaningful things here.
And what you describe only helps you avoid a conviction. It does not actually remedy the violation of your rights. If a federal agent just beats the shit out of you for no reason and then you are not charged then the mechanism of suing them is Bivens, which has been gutted by the courts.