The crazy world of insanity law

IT WAS A CRIME that still haunts the nation. On the morning of June 20, 2001, Andrea Yates, a suburban Houston housewife, made breakfast for her five children and then methodically drowned each one -- Noah, 7; John, 5; Paul 3; Luke, 2; and Mary, 6 months -- in the family's guest bathroom. She then spread four of the bodies out on her bed, leaving Noah floating in the tub. After that, she called the police and her husband to disclose the crime amid a rambling account of being possessed by Satan.

Yates should have been an easy case for the insanity defense. She had a long, documented history of schizophrenia and postpartum depression. She had attempted suicide twice, and only weeks before she had been held in a mental hospital. Shortly before the murders, her doctor had taken her off her medication. She soon began to experience delusional communications from God telling her to kill the children to protect them. Her treating doctor at the time described her as "one of the sickest patients I've ever seen."

The senseless horror of the killings strongly supported a claim of insanity. Even in our collective anger following the murders, many people knew instinctively that this mother was seriously ill. But Texas has an insanity standard shaped more by political than clinical realities. Under that standard, even Yates was found to be sane, convicted and sentenced to life in prison.

Now, however, she's getting another chance. On Wednesday, the state's highest court threw out her conviction and sent the case back for a new trial because of overzealous prosecutors and false testimony by the prosecution's key expert witness, Newport Beach psychiatrist Dr. Park Dietz. This time, it is to be hoped that the trial will focus the nation's attention on the insanity defense and how states such as Texas routinely ignore clear mental illness in their eagerness to extract popular justice.

In recent years, states have made it more and more difficult to claim insanity. After John Hinckley Jr. was found insane in the shooting of President Reagan, many states adopted new, stricter standards. For example, Texas used to accept that a person was insane even if he knew that he was committing a crime, as long as he could convince a jury that he could not stop himself because of mental illness. Yates would have easily satisfied that standard.

However, Texas changed the rule in 1983 to require a showing that a defendant could not distinguish right from wrong. Thus, even if Yates was obeying Satan, she was still sane if she knew it was wrong on some level.