I've had monty almost a year. I'm using a glass tank with a lid hinged in the middle. She has never gotten out before. I don't see how it's human error if he hasn't touched the enclosure since I left 3 days ago. The lid is closed. My boyfriend has owned ball pythons before so no, I don't need a new boyfriend, thanks for that suggestion. The only time she even brings her head to the top of the tank is when it's feeding time. I've had him check the heat lamp to make sure it's on. Her water is full and fresh. The lid of the tank and the tank itself. Have a spot to lock the lid down, but only on one side, I have a carribeaner on the side that can lock, so we've ruled out it being that side of the tank. The lid I have on there isn't the lid that came with the tank, but it is the correct size. The best remedy I can think of is to get some of that thick foam tape and add it to the inside of the lid so there are no gaps and the lid practically has to be forced on.