If marijuana, cocaine and Herion be legalized?

I read this interesting article http://www.druglibrary.org/schaffer/Misc/roe1.htm and wondered. Note: I'm not talking about all drugs, for example, PCP, LSD and methamphetamine.

I work in the same case to legalize marijuana. Here is a good documentary to see it. http://video.google.com/videoplay?docid=-9077214414651731007