Also ask if you can leave, if you're being detained, or being arrested.

In that Florida story, I don't think there's any way they could argue he wasn't arrested when they pulled him from his vehicle and took him against his will to a different place, but other times police can basically interrogate you and as long as you are technically free to go they neither have to volunteer that fact nor honor any requests for an attorney.

There's no hard and fast rule when a detention transforms into arrest, but they can't detain you indefinitely. They either have to escalate to an arrest or let you go. Refuse to speak, ask to leave and if they won't let you leave ask for an attorney.