actually 捕まる has nothing to do with police

Everyone translates 捕まる as 'to get arrested' which is just flat out wrong. Actually, it just means 'to be held onto'. Like, you can 捕まる onto a train leather strap. If a cop does it, sure, you're 'held' but it's not a legal term. It's just physical grabbing. If you aren't physically touching them, they didn't 捕まる you. It's basic physics guys, don't let textbooks lie to you.