When Charlie Sheen says he's not using drugs, I think what he really means is, "I'm using a lot of drugs." (Actually, I'll note that '20/20' gave him a drug test, which he passed, meaning he's obviously just full-blown crazy at this point).
Here's Sheen's interview with 'Today,' which aired this morning. Sheen says he plans to sue CBS for yanking 'Two and a Half Men.'
'Today' will air more of the Sheen interview on Tuesday morning's show, and ABC will air their Sheen interview Tuesday night at 10pm on '20/20.'
Update: Sheen gave another even more bizarre interview to TMZ today. Right after that happened, his longtime publicist resigned. Can't say I blame him.