We also have serial killers here in Germany and prison system as well... Death penalty are banned in Europe countries. It's rarely that they repeat to kill anyone after get out of prison. They have rebailition to correct their behavior... Really depend on form of serial killers... accord the decision of judge and experts... If serious one, then life sentence.
Not what I mean, we have brutal killers from gangs up in North California prison and they still order execute murders thru mails to their gang memebers around here. They contiune order killing from inside prison to outsiders. This is what I am trying to say. Even we pay alot of money to keep them separate from us but it does not work. Many time I put mails in the mailbox with pencil drawing right front of letters. They were addressed from state prisons. I can not do anything because it is their rights to write mails to those addresses. Prison guards need to read them before they send them out but there is secret code hidden in the mails and I do not think they caught those secret codes enough. Life sentences for those killers suck, they will never have a golden heart.