Page last updated at 08:19 GMT, Wednesday, 13 August 2008 09:19 UK

Guarding the border: Tracking


The US-Canada border runs for more than five thousand miles through some of the remotest areas in the world.

Now there are concerns that the criminal gangs who transport drugs, weapons and counterfeit cash across the border could turn to terrorism.

Humphrey Hawksley meets Lee Pinkerton, senior agent of the US Border Patrol, as they go out tracking with their mustang horses - an ancient skill of reading tracks and footprints.


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