Looks like the DEA is cracking down on online pharmacies:

“The combined efforts of law enforcement agencies in an investigation of this magnitude produce a formidable force against narcotics trafficking and money laundering. Individuals and businesses utilizing the Internet to sell pharmaceuticals are bound by the same laws and regulations that apply to the corner drug store,” said Nancy Jardini, Chief, IRS Criminal Investigation. “The link between where the money comes from, who gets it, when it is received, and where it is stored or deposited, can provide evidence that a crime was committed. Finding and connecting those links is what IRS brings to this cooperative effort.”
Read more at http://www.usdoj.gov/dea/pubs/pressrel/pr042005.html