They might be referring to the experiments allegedly done on molestation victims in the larger pedophile rings. Mind control stuff. Some of the victims have spoken up about it. It’s hard to believe but as we know, that doesn’t mean it didn’t happen.
In case you haven’t seen this. Numbers 1 and 4 from the list at link.
https://www.activistpost.com/2017/12/top-ten-conspiracy-theories-turned-fact-2017.html