U.S. Customs and Border Protection (CBP) is the lead federal agency responsible for inspecting travellers who seek to smuggle large volumes of cash, called bulk cash, when leaving the country through land ports of entry. It is estimated that criminals smuggle $18 billion to $39 billion a year in bulk cash across the south-west border. This book examines U.S. efforts to stem cross-border money laundering through the use of devices called stored value, such as prepaid cards and the corresponding regulatory gaps that may exist.