Yesterday, had a guy that looked familiar, with the exact same complaint I'd seen in the same part of the same ED recently (as there are at least 10 EDs in the driving area, and several have different sections), but he denied he'd seen me before. I did a little checking, and found that this guy had registered under a completely different name, with another made-up social security number (one that had, like the first time, never been issued), with a similar birthdate. More checking found that, on the last visit, his emergency contact was being seen at another ED in the health system at the same time, for a pain complaint. Here he is, though, not one month, not two weeks, but just 9 days later - and saying he didn't remember me.
When confronted by police, he gave up the whole game. Apparently, he was convicted a few years ago of some similar thing. What was interesting was the names; it was sort of a thing like: John Simon Ritchie, a/k/a Simon Richards, Richard Simons, Simon Johns, John Ritchie, Sid Vicious.
He was escorted out, to never return. However, those trespass orders seem to not be enforced.