The UK government will not block plans for a drug consumption room pilot in Scotland, the Scottish secretary has confirmed.
Alister Jack said Westminster would not intervene, but that there were no plans to devolve drugs laws to Holyrood.
It came after the Lord Advocate said it would not be in the public interest to prosecute users of drug consumption rooms for simple possession offences.
The Scottish government is backing plans to set up a pilot in Glasgow.
Campaigners say that drug consumption rooms – facilities where people can inject illegal drugs under supervision – can reduce overdose deaths, public injecting and drug-related litter.
A number of medical groups have backed the idea as a harm reduction measure, as part of a wider drugs strategy.
But others oppose them, claiming they send out the wrong signal about the dangers of drugs, and could divert resources away from tackling the the problem through treatment-based approaches.
Speaking in the House of Commons, Mr Jack said: “Drug consumption rooms are not the easy solution.
“There is no safe way to take illegal drugs. They devastate lives, the ruin families, they damage communities and the UK government believes the police and the procurator fiscal service should fully enforce the law.
“However, if the Scottish government and the Lord Advocate decide to proceed with a pilot on drugs consumption rooms, the UK government will not intervene.”
The Scottish secretary said the Scottish government now had “no excuses” to tackle the country’s drug death rate, which is the highest in Europe despite falling to a five-year low last year. Figures for the first six months of this year show a year on year increase.
SNP Scotland spokesman Tommy Sheppard described the Lord Advocate’s statement as a “game-changer” as it removes “one of the major obstacles” to a pilot facility to help prevent overdoses.
The Home Affairs Committee at Westminster recommended previously that the Misuse of Drugs Act (1971) be amended to allow a pilot project to run in Scotland, but the call was rejected by the Home Office.
Drug laws are reserved to the UK government but Scotland’s Lord Advocate Dorothy Bain KC sets out the rules on whether prosecutions should take place.
Scottish Drugs and Alcohol Policy Minister Elena Whitham called Ms Bain’s announcement a “significant moment” in Scotland’s mission to tackle drug deaths.
Ms Whitham has been examining plans for a pilot project developed by Glasgow City Health and Social Care Partnership (HSCP) and Police Scotland, facilitated by the Scottish government.
Those plans are expected to be presented for approval to the Glasgow City Integration Joint Board – which brings together council and health officials – at its next meeting on 27 September.
Ms Whitham said she would like to see the facilities rolled out across the country if the pilot is successful, and that she would “absolutely not” cut funding for other drug recovery services to launch the pilot.