Final answer:
Customs and Border Protection (CBP) is the agency that maintains records of transport of amounts exceeding $10,000 into or out of the US, using advanced scanning technology to enforce this regulation.
Step-by-step explanation:
The agency that maintains records of transport of more than $10,000 into the US or out is Customs and Border Protection (CBP). This enforcement agency operates under the Department of Homeland Security and is responsible for regulating and facilitating international trade, collecting import duties, and enforcing U.S. regulations, including trade, customs, and immigration.
When individuals or entities transport currency or other monetary instruments exceeding $10,000, they must file a report with CBP. Customs officers are equipped with technology such as gamma ray-, x-ray-, or neutron-scanning devices to reveal the contents of trucks and cars, ensuring that any attempt to evade this requirement is detected.