Export controls restrict how controlled technology and data cross borders. The US Export Administration Regulations (EAR) cover dual-use items, and like ITAR, they treat showing controlled information to a foreign national as a deemed export, wherever it happens.
For workplace teams this lands as access policy: which visitors and contractors may enter labs or production areas, what screening happens before arrival, and what the entry log must prove afterwards. The paperwork is legal territory; the physical enforcement is a front-desk and zoning problem.