"Sessions said that he has been diagnosed with snake-related post-traumatic stress disorder and that the house should be condemned."

Oh fer gosh sakes. I'd say it was stress about getting screwed over by the sellers.

As far as the bats go, Bobert, get after them and don't worry about THEir environment. Do the netting or the light or the music thing and don't let several dozen bats infest your home with disease and batshit. If it was my house, the flying rats would already be goneD one way or another.... in a max of two days if I had let them live which I definitely would tried to accomplish but wouldn't be terribly concerned about if they didn't flock off.