Whitney Houston admits past drug use, but the singer says "I’m beyond it." music_houston_whitney.jpg home Houston Exclusive http://abcnews.go.com/sections/primetime/videofiles/Video/primetime_houston_video.ram 10390230939770 abcnews_free.gif superpass.gif http://abcnews.go.com/sections/primetime/videofiles/Video/primetime_houston_video.ram 10390230939771 PLAY lock_icon.gif lock_icon.gif lock_icon.gif big_headline