But a customs seizure months later at East Midlands Airport of fake Monster headphones produced another lead.

BBC: Internet counterfeit goods seller Michael Reeder jailed

The combined efforts of police, customs officers and informers lead to the seizure of perhaps 30% of the world's heroin and cocaine output.

ECONOMIST: Round and round the coca bush

When customs authorities in Brussels confiscated the biggest ever seizure of illegal medicines in Europe last year, it was anti-malaria pills headed for Africa that they intercepted, rather than lifestyle drugs.

CNN: Fighting the growing menace of fake drugs