I'd suggest taking a closer look at your link .....
The link goes on to show the falacy of the data you support.
My personal view is to legalize EVERYTHING. Make it cheap, sell it at Wal-Mart to anyone over 18/21. This will have a two-fold impact.
First off, the current drug users will have a heyday. They will find themselves available to afford their drug of choice, and will either Overdose (self-correcting problem), or will live through this phase and then want to get free. At this time, the money we save on the WoD can be used to help subsidize their Drug Recovery program (I'd suggest an 80/20 split; nothing is ever free).
Secondly, kiddies will see their friends die, the Gangsta's will be out of business, as you can't compete with Free Enterprize. Drugs will become 'un-cool'.
This policy worked prior to the USA having an Anti-Drug policy and law enforcement division. Coke used to have Cocaine in it. Drug users were held in disdain, and society did prosper. By making it illegal, we have created a demand that simply wasn't there before (historically speaking).
Won't happen. Overdose is primarily a problem that arises out of the blackmarket nature of the business. Take heroine for example. Good stuff in the country use to be about 6 to 8% pure. Average junk 4%. Weak heroine 2 to 3%. Availability is always in flux. Overdoses occur when a period of low availability (resulting in lower quality due to increased cutting) ends with arrival of new shipments. Quality stuff is suddenly put on the market. When word does not reach the junky that he is getting really good stuff, he treats it as the recent usual and overdoses.