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N.D. (KFGO) – The parents of a missing North Dakota State College of Science student say they’ve hired a private investigator because the police investigation has gone cold.

20-year-old Andrew Sadek left his dorm on May 1 and hasn’t been seen since. Authorities days later issued an arrest warrant charging Sadek with two counts of delivery of a controlled substance.

Sadek’s parents say they believe their son is alive, but scared. The Sadeks say they didn’t know their son was under investigation in a drug case.

Officials searched for Sadek in early May for several days but found no clues to explain his disappearance.