[newcats]

Doesn't matter if it is a .gov site or not, I am sure there are tons of decades old studies and reports that aren't hosted on government servers anymore. It is a matter of storage capacity vs. importance and relevancy.
You made it sound like the report was never to see the light of day again.
Wrong. Guess it was just too much work to look for it.

[tacticalogic]

Doesn't matter if it is a .gov site or not, I am sure there are tons of decades old studies and reports that aren't hosted on government servers

There are indeed. But as far as I know, this is the only research done on the subject by the federal government directly. Doesn't it seem the least bit odd that of all the information published on all the websites maintained by the Justice Department, the DEA, and the ONDCP, ostensibly for "public education", there is no mention of it anywhere?