For those who are even willing to acknowledge the existence of evil, it's certainly hard to define. Now, some forensic scientists have shown the willingness to introduce the term into their analysis of the characters of the most depraved among us.

It's an interesting question, the existence of evil. And it's a chilling possibility that some of the worst are known not by the deeds they commit themselves, but by the emotional, moral and spiritual wreckage that they leave in their wake.