The Drugs Squad found 30 grams of heroin and 250 grams of cannabis resin in the possession of a 33-year-old Libyan man in Buġibba on Sunday afternoon.
The police said they had been tipped off that the man was trafficking drugs in the area.
They said the heroin was found in his car and the cannabis in his apartment, hidden in the kitchen.
He is expected to be arraigned today.