Debate on internet drugs trade
The number of listings offering illegal drugs for sale on the "dark net" appears to have more than doubled in less than a year, BBC News has learned.
The US Federal Bureau of Investigation (FBI) closed down the original online illegal drug market, Silk Road, in 2013.
But new figures suggest the trade has actually increased since then.
And other research indicates one in four British drug users has accessed hidden websites.
Sam (not his real name) told BBC News why he now buys cannabis on the Dark Net, while Caroline Young, deputy director of the National Crime Agency's Organised Crime Command, says the authorities are determined to crack down.
Camera/editing: Tony Smith
31 Jul 2014