When a committee of MPs recently urged the government to rethink its policy on drugs, there was a firm response from the Home Office - decriminalisation is not an option.
Ministers pointed to a decline in drug use as evidence that current policies are working.
But the fall in the use of illegal drugs appears to have been happening over a period much longer than the life cycle of single governments.
The Today programme's Tom Bateman has been trying to find out what is really changing in Britain's relationship with illegal drugs.
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