I think what is confusing is likely that the investigators/detectives were probably trying to make sure that the girl was actually in the house where the sex offender was registered or technically living, and not maybe kept somewhere else. A lot of detective work is building the case, but also confirming what you believe is actually true and you need the evidence to also request the warrant on factual grounds. They could have busted in the door of that house and found that there was no such brick to be found anywhere and the girl was sold off to someone else or something like that.

It’s really rather sick and deranged though that this kind of dynamic of women with children associating with sex offenders is not exactly rare. Frankly, I hope the mother was also charged.