Criminal Law: Question of Y

Geneticists have yet to prove that men who carry an extra male or Y chromosome in their body cells tend to be criminally violent. Yet, increasing evidence supports the theory that such men are overaggressive "supermales" inclined toward mayhem (TIME, May 3). This month attorneys in two widely separated cases made courtroom history by introducing the disputed concept in defense of two accused killers.

In Paris, Daniel Hugon was being tried for strangling to death a 61-year-old prostitute. His lawyers cited medical evidence that the 32-year-old drifter had required psychiatric care at 17, attempted suicide five times, and suffered from...

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