South Wales Police is investigating allegations of substance misuse in the Welsh Assembly after traces of the class A drug cocaine was found in toilets.
Following information given to ITV Wales, an investigation was carried out in toilets, that cannot be used by the general public, over a four week period.
Using a swab testing kit that is designed to turn blue when it comes into contact with traces of cocaine, surfaces in two out of eight toilets tested positive.
The toilets in question can only be accessed by a security pass that is normally issued to different groups of staff and employers working at the National Assembly for Wales including Assembly Members and the staff they employ, Welsh Government, media organisations, contractors, Assembly Commission staff and visitors.
Guests of pass holders can also access the toilets.
Swabs were taken from the same two toilets on four separate occasions over a one month period - and traces of the class A drug showed up each time.
But all other samples in different toilets came back negative.
A sample of the blue swabs were sent for toxicology tests at the Queen Mary University of London for verification, along with one that had not turned blue.
Professor of Clinical Pharmacology Atholl Johnston confirmed to ITV Wales there was cocaine present on the blue swabs.
Cocaine use has been in the headlines recently with questions around past use of the drug by prominent politicians, after the UK Environment Secretary Michael Gove admitted he used the drug 20 years ago when working as a journalist.
In a statement, the Assembly Commission said it takes substance misuse on its estate “very seriously” and confirmed it had referred the allegation to the police.
It added, “There are different groups of staff and employers working at the National Assembly for Wales in Cardiff Bay including Assembly Members and the staff they employ, Welsh Government, media organisations, our contractors, Assembly Commission staff and visitors.”
In a short statement, South Wales Police said it has received an allegation regarding substance misuse at the Senedd by the Assembly Commission and that "enquiries are ongoing."