Decriminalising the possession of drugs is better than not decriminalising it. But we're sorry to say that it's not actually enough: it is also necessary to legalise the production and supply of them.

Nick Clegg will today press ahead with plans to decriminalise possession of all drugs – despite charities warning the move will wreck thousands of lives.

The Lib Dem leader is to pledge that his party will bring forward plans to ensure those caught with drugs for ‘personal use’ will no longer face criminal prosecution. Instead, the maximum penalty would be a fine.

The move covers the powerful ‘skunk’ strain of cannabis and hard drugs such as crack cocaine and heroin, as well as ‘soft’ drugs including marijuana and amphetamines.

Not jailing people for ingesting the stimulant of their choice is of course a good thing. If we don't own our own bodies and cannot decide what to put into them then we are not free. And freedom and liberty are the aim and goal, of course.

However, this is not enough, welcome though it is. For there are two problems with drugs. The first is that above, the issue of liberty. The second is the issue of safety. It's all very well to say that we may partake as we wish, subject only to fines. But only with the legalisation of manufacture and supply can there be any form of quality control.

It's worth thinking back to the adulteration of food in Victorian times. The first investigations into what was actually going into processed foods turned up in The Lancet in the late 1840s and early 1850s. And there was most certainly all sorts of very dodgy stuff being added to food. Sometimes knowingly and sometimes not: we seem to recall people using cadmium salts to make sweets look pretty which really isn't something to be recommmended but they didn't know that then.

Legislation to deal with such adulteration really only started in the 1870s. By which time the problem was largely solved. For the information about the adulteration led to producers creating brands which promised no such adulteration. And consumers bought them on such promises. It's not from quite the same time or place but this is akin to Heinz tomato soup conquering the world. Early canning of soups was slightly hit and miss. Heinz kept better control of that process than other competing manufacturers and thus killed fewer people. This became generally known, the brand became a marker of quality and global domination beckoned.

To solve our second problem with drugs we need to allow those same processes free rein. Brands must be allowed, brands that claim to be free of brick dust, to be of a certain purity and also of a certain dose. Tax the heck out of them as well, of course, but legalisation, not just decriminalisation, is the solution to both of our problems about drugs.