So they stick Dexter in prison.
Sooner or latter Dexter is going to get all the pudding.
I mean this one guy in the period of a couple weeks manages to kill the other 150 convicts in prison with him and no one on staff is going to get fired?
His dark passenger is not going to accept no for an answer.
Where should they send him?
Fox River or Oz?
Besides, every time Dexter kills some one, he saves the state millions in trial costs and incarceration fees... If they keep moving Dexter from prison to prison, actually point him at the really expensive burdens to society, Dexter could be come a star chamber force for fiscal responsibility.