The Daily Star reports
The Household Cavalry and the Foot Guards have notched up more busts than any other regiment.
Over 40 members of the two units have tested positive for illegal drugs in the past eight months according to figures from a Freedom of Information request.
Soldiers were busted for snorting cocaine and smoking cannabis while off duty in London and Windsor.
The Household Cavalry are based at Hyde Park Barracks in Knightsbridge, an area teeming with pubs and clubs.
Troops are warned every week that anyone testing positive for illegal drugs will be thrown out.
A senior regimental source said: “Serving in the Household Cavalry is a privilege.
“We are the most senior regiment in the Army and have a very close relationship with the Royal Family.
“Any soldier who brings the name of our regiment into disrepute through drug taking will be dismissed.
“There are no second chances in the Household Cavalry.”
The source added: “All young troopers are told to be very careful when they are on a night out.
Using being drunk as an excuse for taking drugs will not stop them losing their careers.”
The drugs revelation comes just six months after four members of Harry’s old regiment were caught snorting coke in a pub in Windsor just weeks before Harry and Meghan’s wedding.
Two of the four tested positive and were kicked out of the Army.
A further eight squaddies tested positive for cocaine and other class A drugs a few weeks later after the entire regiment had compulsory testing.
The Foot Guards – said to be the Queen’s favourite regiment – have one of the worst drugs records in the Army.