That's what I had in mind..
I was just wondering what Xulld had in mind...
Yup, PC requires evidence. Not all evidence is equal, but RAS requires much less evidence, PC requires more, and a conviction requires it to be conclusive.
Traffic stop is a great example.
Officer pulls you over for a broken tail light. He flashes his light in your eyes and notices you have very red eyes and when he asks you a question he notices your slurring. He has RAS, based on this
evidence. He flashes his light through the windows and sees a 4 foot bong in the floor boards. He has probable cause to search the vehicle, but not before seeing the bong. Seeing the bong is
evidence, so was the red eyes and slurring, but evidence of a lesser kind, less conclusive evidence, but enough to be suspicious, which promotes the visual search, which reveals additional evidence which provides probable cause.
Evidence all along the way is needed to move along the path toward arrest.
(I am not an officer of law, if any of the steps I presented are incorrect feel free to correct them, but the theme I believe is accurate.)
If the officer had none of these factors, but still wanted to search the vehicle, found nothing, and still arrested the guy, the officer could get in a lot of trouble over a civil rights violation.
ie, you cant just arrest someone without evidence and not have some accountability. (I understand that its not unheard of for officers to make up stuff, or abuse their authority, but that is a different matter entirely)
They can always arrest the shooter and then let him go a few hours later if they decide the shooting was justified.
The police are granted powers to detain without arresting a suspect in the course of an initial investigation. This is what happens while they develop probable cause, or if they fail to . . . then they release the chap.
If by arrest you mean, hand cuff and hold on to vs the actual legal definition then we are not really arguing so much as defining terms.
The moral of the story is that Probable cause for an arrest does in fact require evidence that a crime has been committed. Detainment only requires RAS, which stands for Reasonable Articulable Suspicion. Check out Terry v. Ohio for a good example and the case law involved with the distinctions.