Gardai at Naas are continuing to question a man in connection with the seizure of drugs valued at €344,000 in Kildare Town on Tuesday.
Quantities of MDMA and Xanax were discovered during a Naas Traffic Corps operation in which Automatic Number Plate Recognition technology was in used.
A car was stopped at Curragh Farm, as it lacked tax and insurance.
Gardai searched the vehicle and found the drugs.
A man and woman, both in their thirties, were subsequently arrested and taken to Naas Garda Station for questioning.
The woman has been released without charge, and a file is being prepared for the Director of Public Prosecutions.
The man remains in custody.