NEW YORK - A judge has told so-called preppie killer Robert Chambers he must let prosecutors see his medical records before his upcoming trial on drug charges or he will not be allowed to offer an insanity defense.

Chambers, 41, is jailed without bail and facing trial on charges of cocaine possession and sales out of a midtown Manhattan apartment he shared with girlfriend Shawn Kovell, 39. Chambers has pleaded not guilty to the charges.

His lawyer, Valerie Van Leer Greenberg, said she plans to present a psychiatric defense to fight charges that could put him in prison for life. She said his brain and judgment are damaged because of years of drug abuse.

Prosecutors told state Supreme Court Justice Edward McLaughlin that they wanted to see Chambers' medical records from when he was on welfare and those from the Department of Probation so they could respond to the psychiatric defense.

Medical records are confidential and privileged and usually are not available without the patient's waiver or a court order. But if Chambers claims a medical problem, prosecutors have a right to see his medical history so they can respond.