Four men were held on Friday night in separate roadblocks carried out by the Armed Forces in the southern part of the island.
AFM soldiers held the men, aged between 18 and 38, in four separate cases when suspected heroin and cannabis was found.
The men, from Qormi, Cospicua, Żabbar and Senglea, were handed over to the police drug squad for questioning. A man was also held on suspicion of driving while under the influence of alcohol.