I don't think they know either. I wasn't addressing that issue in my post, however; I didn't say anything either way about whether they did or did not.

And no, I don't think that "implanted killer hypnotic personality" or whatever is the same as actual multiplicity. There have been claims that various government programs were used to create large and extensive multiple systems in previously singlet people, who were all perfectly mind-controlled to perform specific duties, though. Those are the cases where I say I would need to see a lot more evidence before I could buy that such things were going on.