Four men were detained by the army in roadblocks set up in Cospicua and Qormi on Sunday night.
In Cospicua, a 19-year-old was caught with cannabis resin and a 20-year-old was found in possession of two knives.
Later, in Qormi, two men, a 51-year-old and 43-year-old, were caught driving without a licence, while the latter was neither covered by insurance.
The men were handed over to the police for further investigation.