Four people from Cospicua and Paola were detained by the Armed Forces during a roadblock in the south of the island on Friday night.
The AFM detained a youngster who was found in possession of five small sachets of suspected cocaine and 15 blue tablets thought to be Ecstasy. The three others were found in possession of cannabis.
The suspects, aged between 22 and 43, were handed over to the police for further questioning.