SOUTHAMPTON, UNITED KINGDOM – AUGUST 13: A Border Force detector dog checks inside a shipping container at Southampton docks on August 13, 2014 in Southampton, England. Border Force is the law enforcement command within the Home Office responsible for the security of the UK border by enforcing immigration and customs controls on people and goods entering the UK. Border Force officers work at 140 sea and airports across the UK and overseas. (Photo by Matt Cardy/Getty Images)