The word detained and the word arrested are completely different things and you need to know the difference. Let me dumb it down for you. The difference between detained and arrested can really be more about timing. Like if you're being arrested, you're in for the long haul. You're going to go to the booking room. You're going to be handcuffed, put in the back seat, and driven downtown. If you're being detained, you might be handcuffed and put in the back seat and driven downtown, but they're allowed to detain you for a reasonable amount of time while they investigate this situation that they're investigating. You have to ask this police officer, "Am I being detained or am I under arrest?" If he says you're only being detained, then you invoke your right to remain silent right then.