The discovery occurred on May 4 during a routine package inspection at the Gran Canaria prison. The intervention was made possible by the Canine Unit of Canarias, whose specialist dogs, Harry and Alma, alerted to a suspicious postal delivery.

Following the dogs' alert, officers conducted a thorough analysis of the package. A scanner examination revealed structural anomalies in the garments. Upon meticulously inspecting the towel seams, investigators found that these served as a hiding place for the drugs, making them difficult to detect during a basic manual inspection.

The Superior Police Headquarters of Canarias confirmed the seizure of 18.30 grams of cocaine and 5.27 grams of heroin. This action is part of preventive security plans to prevent the entry of narcotics into the archipelago's prisons, strengthening surveillance over shipments made by family and friends.

The National Police maintains these periodic controls in package areas and access points to penitentiary centers. Coordination with Prison Institutions is crucial to locate these substances before they reach the cells, thus ensuring the safety of both workers and the inmate population in Canarias.