Whereas legitimate Mexican traders have free access to America and Canada via the North American Free-Trade Agreement (NAFTA), drug smugglers are granted tariff-free entry to every country in the world thanks to the Single Convention on Narcotic Drugs, which prohibits the regulation or taxation of their product.

ECONOMIST: From HR to CSR: management lessons from Mexico??s drug lords

John Scott, director of Drug-Free Sport at UK Sport, has welcomed the proposal, which will eventually see a standard tariff implemented globally.

BBC: SPORT | Other Sport... | Wada plans to increase drug bans