Keith Vaz, chairman of the Commons home affairs select committee, said a Royal Commission is needed to explore all the issues around drugs.
He called for testing in prisons, measures to tackle legal highs and a look at how drugs money flows through our banking system.
He said: "In prisons we believe there should be compulsory testing, on arrival and on exit, and random testing during a prison sentence.
"On legal highs, it's moving so fast, there is a new legal drug every single month and we need a fast track system.
"Finally if you look at the banking system, this is the most lucrative crime in the world."
More top news
Mostly dry across the north of the UK today, with spells of sunshine and isolated heavy showers for some.
Huntingdon's, autism and congenital heart conditions are among those likely to be exempt from reassessment.
A woman and man have been charged with murder after a baby was found unresponsive on a bus.