Sunak is unlikely to be in power for longer than it takes for the pilot to generate ‘usable’ statistical results.
The Conservatives can then use this scheme to attack Labour while in opposition, ‘Labour is weak on drugs!’ Labour then u-turns ‘They can’t make up their mind!’ and closes the trial down, ‘Sunak let this pioneering study go on and now Labour have shut it down!’
Alternative scenario: it works and Labour don’t shut it down, The Sun running the headline ‘300% leap in crime near treatment room!’ Conservatives: ‘Labour is soft on crime, mollycoddling junkies while ordinary people struggle.’
If you always argue from a place of bad faith then life never disappoints you.