Acting on a tip-off that some students were involved in supplying ganja, police conducted raids in Saravanampatti locality and seized a few packets of ganja from the room of a private accommodation occupied by two thrid year engineering students.
The two students and two others, from Theni, who were in the room, were arrested, police said.
A search was on for one Rajapandiyan, who was allegedly supplying ganja to the students, police added.