Prescription drug trade booms on 'dark' web

Prescription drugs are increasingly being traded through online black market sites like the Silk Road, an Australian investigation reveals.

With sellers hawking everything from benzodiazepines to sildenafil (Viagra) and SSRIs, pharmaceuticals are now second only to marijuana in their availability on the notorious drug-trading site.

The Silk Road was shut down by the US FBI in October but quickly re-emerged, along with a host of spin-offs such as the Black Market Reloaded.

Known collectively as the "dark" or "deep" web, the illegal