We recently acquired a 4 ft ball python and the previous owner informed us that she will only eat live. so today my wife went to pick up a couple mice from pet smart and one of the people assisting her said that they inject the mice so if you feed them to a snake it will kill the snake? i personally think the guy was full of it and couldn't find and info to prove or disprove it. My wife didn't let on that the mice where for feeding our new edition either since we have herd rumors that stores can and will refuse to sell you mice if they are aware that you are using them as feeder mice. if anyone can inform me better on the subject it would be appreciated.