@dafyre said:
If this is in the US, they have to tell you before they arrest you, don't they?
Define "have to"? Is there a law on the books that says they have to? Yes. Do judges regularly uphold that? No.
The US has rather a claim to fame for arrests and incarceration without charges, even of minors. NYC has had several deaths around this recently and it is causing quite a stir, kids held for a year without a charge in brutal solitary and adult confinement. The entire detention center in Cuba's purpose is to have no charges with incarceration. It's not just something done in the US. It's something we have a system for doing and are passionate about protecting.