In the Canadian context, that's been the stated policy for decades. There's never been any way of actually achieving complete prohibition of drugs in prisons.
The second point is about the use of taxpayers' funds. If we have evidence that mandatory minimum sentencing approaches do not work in the case of drug offences, and we are going to spend money on pursuing an approach that does not work when we know there are adverse health consequences that we will pay for down the road, then it seems to me that's not a good use of taxpayers' money and that we ought to be putting that money into more effective responses.