I heard it was a neighbor that complained. They probably freaked out when they found out about the snakes and thought "oh my god they're gonna get out, hunt us all down and kill us in our sleep! Call the police!", and since he had no permit they had to tell him to somehow get rid of them.
Animal Planet has done WONDERS in telling the general public that every snake keeper is crazy and has no idea what they're doing with their animals... And that every snake is an uncontrollable monster just biding their time for an opportunity to kill a person.