As someone who has personally known jailhouse snitches, I don't think this is accurate. The biggest problem with becoming a snitch is that you are then forever

As someone who has personally known jailhouse snitches, I don't think this is accurate. The biggest problem with becoming a snitch is that you are then forever more labeled as a snitch, and while (unlike the movies) this is unlikely to result in violence, you will certainly be shunned for the rest of your prison life.