Well I would legalise marijuana, but that's for personal reasons.
To bring something new up, at my school this week we had a talk from an ex-drug addict (I'm talking about serious addict, spending £1,000 minimum per week, stealing etc.)
And he told us that all the heads of police in each region in the UK had a vote on what they would legalise out of drugs. Every single one voted to legalise heroin(!) At first everyone was shocked (obviously...)
But the reason is out of all illegal drugs, heroin takes up the VAST majority of deaths, yet it is the most easily 'fixed' if people weren't afraid of going into a hospital.
Also nearly every single one of those deaths is cause by impure heroin.
So I would legalise heroin, personally never want to take it, but seems like a good idea for the country.