The rise of Ecstasy is a major event in drug history. If current trends continue, 1.8 million Americans will try Ecstasy for the first time in 2004; only marijuana will attract more new users. Overwhelming, positive word of mouth has made Ecstasy a nightmare for drug controllers. On a special edition of 'Primetime Thursday' Peter Jennings tells the epic story of Ecstasy that has never been heard.