#1 - Larry Nassar was a master manipulator (continued)
In fact, when Larry Nassar was under investigation in 2014, he sent police four presentations, a research article and 10 videos to convince them that was he was doing was legal.
He even volunteered to perform a procedure on a police officer if any of them would volunteer to act as his patient.
There were also times when the parents of the person Nassar was treating were in the room during the "treatment". Nassar either positioned himself so that they could not see what, exactly, he was doing, or he would cover his patients with a sheet for the same reason.
Sometimes he would even say things to essentially poke fun at the parents of his patients if they seemed to question his procedures. No matter which way you look at it, he had everybody fooled, and when anyone suspected anything, he could cover it up. He did so for roughly two decades.