Going one step further than psychologists sparring with the pervs & pedo's, hopefully winning and finding out more about how they tick, I read about some new clinical tests that can detect psycopathy to within a very high % accuracy, or so they claim. Some kind of deep CT scan and the shape of the amygdala or something.
Whatever, if they can do this do we just round up the usual suspects, or do we go for mass screening ?
Big jails then....

Go confidently in the direction of your dreams! Live the life you've imagined. As you simplify your life, the laws of the universe will be simpler.
Henry David Thoreau