Dan Rather's brain is damaged from drug abuse:
http://www.frontpagemagazine.com/Articles/ReadArticle.asp?ID=4069
"When Jahr asked if the anchorman himself had smoked marijuana, Dan Rather in part replied: "As a reporter—and I don't want to say that that's the only context—I've tried everything. I can say to you with confidence, I know a fair amount about LSD. I've never been a social user of any of these things, but my curiosity has carried me into a lot of interesting areas."
Jahr quotes Dan Rather as continuing: "As an example, in 1955 or '56, I had someone at the Houston police station shoot me with heroin so I could do a story about it. The experience was a special kind of hell. I came out understanding full well how one could be addicted to 'smack,' and quickly. "
Ack, he's had a thirty year long acid flashback. Makes perfect sense.
Now we all know what everyone suspected after the "What's the frequency, Kenneth?" episode.