A Columbia University student accused of selling LSD on the New York City campus has pleaded guilty to attempted drug possession.

On Tuesday, Adam Klein became the last of five students to plead guilty in a loose-knit campus drug-dealing ring.

He’s expected to get five years’ probation at sentencing, which is scheduled for Feb. 28.

His lawyer, Alan Abramson, says Klein is in drug treatment. Abramson has argued that Klein’s conduct stemmed from addiction. A court turned down Klein’s bid to get a chance to wipe his record clean by completing drug rehabilitation.

The city Special Narcotics Prosecutor’s office says the students sold drugs ranging from marijuana to cocaine out of dorm rooms and fraternity houses.

The university has declined to comment on the students’ current status.