ST. PAUL — Minnesota public safety officials say they are revising a troubled program aimed at training law enforcers how to better spot drug users.

It had been suspended while authorities investigated claims that officers had given people illegal drugs and incentives to participate. The Drug Recognition Evaluators program is also the subject of a federal lawsuit by people who say they were subjected to an “unethical clinical trial.”

State Public Safety State Commissioner Mona Dohman and a state patrol leader were to give details of the updated program at a news conference today.

The drug evaluation and classification program trains officers on how to detect and remove impaired drivers from the road. It has been in existence in Minnesota since 1991, but 48 states have similar programs.