I have heard second hand issues with these. Is there any documented cases of snakes having impaction or digestive problems with these? I take almost every second hand story as someone who has no idea what they are doing grasping at straws to blame why their snake died but I have read several complaints about these so I am curious. I know they are fabulous for lizards that tear and rip their prey apart but for snakes that swallow whole is what I am wondering about.