Recently George Soros along with musician Sting have come together to promote the legalization of drugs in the USA; not just medical marijuana, but all drugs.  I believe the biggest argument against legalization is the number of people who will become addicted to drugs and become a burden on society.  A possible solution to this problem is simple:  Legalize drugs, tax the sale of these drugs, but require any person that receives unemployment, welfare, food stamps, or other social program dollars to take a drug test and PASS before funds are distributed.  If the person is CLEAN than they would be allowed to receive assistance ... if not then NO money.  Logic is simple: if employers can randomly drug test employees and these employees are paying taxes (either income tax or property taxes or sales taxes ... which are obstensibly paid by their income from working) that help support those receiving social assistance (welfare, food stamps, unemployment) than those receiving such aassistance should also be randomly drug tested. 

I don't use drugs and I agree that the legal drug trade causes tremendous amounts of criminal activity ... but I just cannot agree to help support someone's drug habit through my tax dollars.