Two prisoners were caught red handed during a drugs raid at the prisons last night, the Home Affairs Ministry said.
During the raid in Division Two, a substance was found in a cell shared by the two prisoners. One of the prisoners had drugs in his hand and another was holding items related to drug-abuse.
Both prisoners have been put in isolation cells.
The raid was part of a campaign ordered by Home Affairs Minister Manuel Mallia to stamp out drug abuse from the prisons.