Nick Clegg has warned his party that the war on drugs "is not working".
"Treat the people with addictions in the way that they need to be dealt with, which is they need help," he told the Lib Dem conference.
"If you really want to be tough on the Mr Bigs, don't do what we're doing at the moment which is imprisoning hundreds of people for personal possession," Clegg said.
"What happens? They end up getting hooked on harder drugs, they end up hanging out with hardened criminals and they end up coming out as either criminals who inflict further misery on other victims or become even more hapless victims of the criminal gangs."
"How idiotic is that?" the Lib Dem leader added.
You might have thought that the Lib Dems don't get too cross about anything - but the personal tax threshold has really got them going.
With the support of the party leadership, the Lib Dems may be set to drop their opposition to a new runway at Gatwick airport.
Liberal Democrat leader Nick Clegg has unveiled plans for a string of garden cities along a new railway link from Cambridge.