Police were called to the Home Office’s London headquarters after a stash of highly addictive crystal meth was uncovered.
A ‘small quantity’ of the class A drug and a smoking pipe were found in a disabled toilet by security staff at the department’s Westminster office on May 3.
A spokesman for the Home Office said that the police had attended and removed the substance but that no further action was taken.
He said: “We take incidents of this nature extremely seriously, always ensure that proper procedures are followed and take appropriate action based on the advice of the police."
Embarrassingly for Home Secretary Sajid Javid, news about the stash broke the day after he tweeted his commitment to a tough stance on drugs, posing with a sniffer dog and praising the Border Force’s drug efforts as “impressive”.
The discovery is the third of its kind in the last six months at the Home Office headquarters, the department responsible for overseeing the UK’s drug policy. Cocaine was found in April and a separate stash of crystal meth was located in December.
It came just four days after Mr Javid stepped into role as Home Secretary, replacing predecessor Amber Rudd.
A spokesman for Scotland Yard confirmed that drugs officers had attended the offices.
He said: "The substance was seized by officers and taken to a local police station. Advice was provided to security staff. No suspects have been identified at this time."
The Home Office laid out its most recent approach to tackling drug misuse in the 2017 Drug Strategy report, published last July.
It outlined a collaborative approach at local, national and international level aimed at reducing illicit drug use and its harmful effects, and reiterated an on-going commitment to helping existing addicts into recovery.