Of them, 1,771 have been classified according to whether they are at low, moderate or high risk of repeating their crimes.

But the stakes are enormous, she said, and the assailants likely to repeat their crimes.

It's fortunate that many lifers are unlikely to repeat their crimes and can return to society without risk to others.

But supporters say special measures are needed for sexual offenders because they tend to repeat their crimes.

He said that a 1991 study of 600 men treated at his clinic found that about 8 percent repeated their crimes after five years.

Thus, criminals tend to repeat their crimes, and eventually end up facing execution or exile.