FAIRFIELD — Four Fairfield University students face drug charges, and five more were issued infractions following an investigation by the school’s Department of Public Safety.

According to police, campus security received a tip regarding possible drug sales at Claver Hall on campus and began an investigation. The probe monitored a large amount of traffic in and out of three particular rooms in Claver, as well as one student who regularly went between his dorm room in Jogues Hall and Claver, carrying a backpack.

After executing searches of the four rooms last Friday and, according to the report, finding marijuana, psychedelic mushrooms, cocaine, controlled prescription pills and “dozens” items of drug paraphernalia, campus security personnel called Fairfield police, who took the following students into custody:

Dzemal Ganic, 22, of Beaconview Drive, possession of hallucinogens or marijuana, possession of drug paraphernalia.

James G. Brown, 19, Garden Street, Hoboken, N.J., possession of hallucinogens or marijuana, possession of a controlled substance.

Jack Crowley, 20, 23 Foster Crossing, Eastquogue, N.Y., possession of drug paraphernalia, possession of narcotics and possession of a controlled substance or marijuana.

Brian P. Mason, 20, Ware Drive, Norfolk, Mass., possession of drug paraphernalia and possession of a controlled substance or marijuana.

All were released on a promise to appear at state Superior Court in Bridgeport, with Brown, Crowley and Mason given court dates of April 18. Ganic was assigned an April 15 court date.

According to police, five other students were issued tickets for possession of marijuana.