Cocaine found throughout Houses of Parliament (Picture: Getty Images)

A number of private locations within the Houses of Parliament have tested positive for cocaine.

In an investigation conducted by VICE, nine secure areas within the building were checked for the Class A drug, and four came back conclusive.

Various rooms that can only be entered with a pass were swabbed with a simple testing kit, consisting of pale pink wipes that turn blue if traces of cocaine is present.

One of the areas that displayed the highest levels of residue was in the toilets outside of the Strangers Bar, which is only accessible to members of parliament and high ranking public officials.

Earlier this month the original candidates of the Conservative leadership race came clean about their history of illegal drug use.

A number of secure locations within the Houses of Parliament tested positive for cocaine (Picture: Moment RF/Getty Images)

Conservative MP and former leadership contender Michael Gove admitted to snorting cocaine while working as a journalist (Picture: EPA)

Rory Stewart, a former contender in the Tory leadership battle, said that he had previously smoked opium (Picture: Getty Images)

Foreign Secretary Jeremy Hunt admitted to consuming a cannabis lassi (Picture: Getty Images)

Michael Gove admitted to snorting cocaine ‘on several occasions’ during his time as a ‘young journalist’, while Rory Stewart said he had smoked opium at a wedding in Iran.

Jeremy Hunt, Dominic Raab and Andrea Leadsom all confirmed they had previously used cannabis, and Sajid Javid denied ever taking any Class A or Class B substances.

Front runner Boris Johnson confirmed he had enjoyed several joints, but gave conflicting statements about his cocaine use.

He previously admitted to having a ‘solitary line’, although in 2005 during an appearance on BBC’s Have I Got News For You, he joked that he had not actually taken it.

Mr Johnson said: ‘I sneezed and so it did not go up my nose, in fact, I may have been doing icing sugar.’

Dominic Raab said he smoked cannabis as a student (Picture: Getty Images)

Andrea Leadsom has smoked weed before (Picture: AFP/Getty Images)

Boris Johnson said that he ‘sneezed’ and the suspected drug ‘didn’t go up his nose’ (Picture: Getty Images)

Other locations which tested positive were the disabled toilets outside The Woolsack, one of several bars in the Palace of Westminster, as well as two other bathrooms outside of MP’s offices.

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A Parliamentary spokesperson said: ‘Parliament takes the issue of substance misuse very seriously and offers a range of welfare and health support services for those who need them.

‘Parliament is a public place and we welcome over a million visitors a year who have access to the facilities. Should drug use be identified in Parliament, appropriate action would be taken.’