Are most countries' policies on drugs irrational? From the tolerance of Holland and decriminalisation in Portugal to the Philippines, where President Rodrigo Duterte's crackdown on drug users and dealers has claimed thousands of lives, there is little international consensus.

Presenter Manuela Saragosa speaks to David Nutt, professor of Neuropsychopharmacology at Imperial College London, who says some drugs are less harmful than alcohol.

She also speaks to Joao Goulao, one of the architects of Portugal's decriminalisation policy.

And, the BBC's Anna Holligan reports on the rise of nitrous oxide, or laughing gas, in Holland.

(Photo: A woman contemplating pills. Credit: Getty Images)