Drugs in the future?

It's been a recurring, if not central element in cyberpunk and science fiction: widespread use of legal dugs.
William Gibson shaped his sprawl flooded with designer drugs, and the inability to consume them was a major factor in convincing the main character of "neuromancer" to join Armitrages crew, similar themes exist throughout the other two books of the sprawl triology.

The BBC made a great short movie with very strong cuberpunk themes to accompany "the If debate" ... if drugs were legal. Which emulates the future with almost complete drug legalization: the good sides the bad sides, police and corporate world and criminals etc. ...

The government in Huxleys "brave new world" used drugs to control the population, todays situation is similar in a paradoxal way.
Thousands of people go to jail on drug related charges, often victimless crimes. These people come out of jail economically weaker, destitute sometimes. Their property is often seized and sold to further the means of hunting down drug criminals; the proceeds of selling seized property fuel the militarisation of police forces.
No-Knock warrants are a hazard to both the residents of the house being invaded, and the police officers carrying out the warrant. All of this despite the meager amounts of drugs seized on average. Still, these actions are a major source of revenue, which serves to strengthen the seizing forces even more.

This money comes from ordinary citizens who buy drugs. Ideally, the consumers will stay out of jail and keep pumping money into the black market. Then police officers will be able to seize the money (and hopefully arrest a professional criminal in the process). No other tax system drains the population so effectively of money, which they willingly give up.

Why on earth would a government decriminalize drugs? It wouldn't really have a huge impact on availability to come down harder or softer, and they could be taxed. But those taxes are nowhere near the funds seized from the drug trade, especially if you can build a police force that seizes as much as possible from criminals without destroying the black market entirely.
Meanwhile, the war on drugs is a great "reason" to maintain a strong police force, and it provides tools of propaganda for the war on terror, as well as effectively making a growing demographic a slave to the penal system.

In comes the incorporated government: Would they legalise drug use?
If it would benefit them, then yes. If it would allow them to permanently bind employees without causing significant damage to profits, yes. If it would reduce the cost of keeping a working population entertained during their time off, yes. If it would allow them to prolong a mans working day without loss of concentration, yes. If it would make people break down and die before the age of retirement, yes. If it would turn their corporate slaves into an apathic mass unable to rise up and break free ... of course they will.