RENO LIFTS BARRIER TO OREGON'S LAW ON AIDED SUICIDE
Atty Gen Janet Reno says Federal Government will not prosecute doctors in Oregon who use state's assisted-suicide law to prescribe lethal drugs to terminally ill patients; overrules policy statement issued without her knowledge or consent in November by Thomas A Constantine, Administrator of Drug Enforcement Administration; says DEA's responsibility is combating drug trafficking, nto resolving profound moral and ethnical questions raised by Oregon law (M)