[USA] Methadone Diversion, Abuse, and Misuse:Deaths Increasing at Alarming Rate / National Drug Intelligence Center, 16 November 2007
PDF - http://www.usdoj.gov/ndic/pubs25/25930/index.htm
"This assessment analyses the increase in methadone-related deaths since the late 1990s, the increase in legitimately prescribed and disbursed methadone, and the thefts and increased availability of diverted methadone."