If you are referring to Marijuana Legalization in Colorado, then it is already legal and being distributed in stores.
Don't confuse street drugs with legalized drugs. When a drug is legalized, it is kept under tight control by the government, and is sold in a safe environment away from drug lords, the government also controls what is put into the drugs so that they are 'safer' to consume. But the drugs on the streets would still be illegal.
If you are referring to something else, then please let me know, and I will correct my answer.
I hope this helps. :-)