A male was arrested last night following a checkpoint on Mailcoach Road, in Sligo, on suspicion of Driving under the influence of an intoxicant.
He was arrested and brought to Ballymote Garda Station, and had to provide a specimen of blood.
He will now have to await the results to come back from the Medical Bureau of Road Safety.
He faces a possible court appearance, if the test results return positive for drugs.
Gardai are reminding motorists to Never ever drive under the influence of any intoxicants.