If you have a warrant for your arrest, they will detain you. Or if you are under house arrest or something. They can't stop you on mere suspicion, though. I do

If you have a warrant for your arrest, they will detain you. Or if you are under house arrest or something. They can't stop you on mere suspicion, though. I don't mean to say "if you did nothing wrong you have nothing to fear". It's more like "if you weren't literally convicted of a crime, don't worry".