I think cuffing is defintiely SOP. They can do that all day long without an arrest. The only issue is the transportation to the station. Either he went along willingly-which I assume he did -or it is ok to transport someone when they are involved ina shooting death. Either way to LE this did not constitute an arrest-but perhaps could be argued that it did rise to the level, but I think it would fail with what we know at this point.That is my opinion as well. Police often handcuff people that they aren't arresting, even if it's just to incapacitate them until they can decide what to do with them - or maybe I've seen to many cop shows where they cuff a guy, sit him on the curb or in the back of the car while they clear up other aspects of the situation, and then end up releasing him. I suspect it's just SOP to do so in certain situations, even if the person is coming along voluntarily. Considering how comfortable Zimmerman looks while hanging around and chatting with the officers in the video, walking around freely, not being watched or treated with suspicion, etc., he is almost certainly there voluntarily. He looks like someone who already knows he'll get to go home later, but, again, that's JMO.
JMHO