ESTIMATES FROM THE SURVEY ARE THAT 61 PERCENT OF THE INMATES HAD USED DRUGS - INCLUDING HEROIN, COCAINE, METHADONE, AMPHETAMINES, BARBITUATES, AND MARIJUANA WITHOUT A DOCTOR'S PERSCRIPTION, AND OUTSIDE OF A TREATMENT PROGRAM. MOST OFTEN USED WAS MARIJUANA. ONE FIFTH OF THE INMATES HAD BEEN DAILY HEROIN USERS, ONE QUARTER OF THE INMATES SAID THAT THEY WERE UNDER THE INFLUENCE OF DRUGS AT THE TIME OF THE OFFENSES RESULTING IN THEIR IMPRISONMENT, AND FOUR PERCENT HAD BEEN ENROLLED IN DRUG TREATMENT. FORTY-THREE PERCENT HAD BEEN DRINKING AT THE TIME OF THEIR OFFENSE.