I don't understand this. It may well make sense, but there are no details yet.
The Supreme Court ruled Monday the federal government has the power to indefinitely keep some sex offenders behind bars after they have served their sentences, if officials determine those inmates may prove "sexually dangerous" in the future.
"The federal government, as custodian of its prisoners, has the constitutional power to act in order to protect nearby (and other) communities from the danger such prisoners may pose," Justice Stephen Breyer wrote for the 7-2 majority
UPDATE: If this means that there is a normal hearing, going toward a criminal insanity commitment, then okay. But....if the guy is certifiably insane, how could it be that he could be tried, and sentenced in the first place? I still don't understand.
UPDATE II: Roger Pilon clarifies....