Ana Sofia Garcia Mendez:
Before going in Ana Sofía asks, "Should we make sure he has a lawyer so the lawyer can at least hear us question him? I don't know what the procedure should be." She also tells Price and the others, "He hasn't merged with any of his clones that were on the island and met me. Otherwise he would have recognized me, having absorbed their memories."
Depending on the response, Ana Sofía either waits or heads in fairly soon.
"He's not under arrest," Frank replied, based on his admittedly limited knowledge of the judicial system. All of the TV shows he'd ever watched, though, agreed on this point. They weren't required to get him a lawyer unless he asked for one, and they weren't required to specifically
inform him of his right to representation unless they were actually placing him under arrest.
"We're in the clear on that point."
What he didn't bother to say was that they weren't entirely in the clear where it came to Ana Sofia's mental influence. Cooper and Price assured them that they had a wide latitude where it came to this sort of thing, but it still felt pretty... iffy.