Which agency regulates the use of breath alcohol testing devices like the Intoxilyzer 8000?

The correct choice is the National Highway Traffic Safety Administration (NHTSA), as it plays a crucial role in setting guidelines and regulations for breath alcohol testing devices, including the Intoxilyzer 8000. NHTSA is responsible for enforcing laws related to highway safety and reducing drunk driving incidents. They provide standards and protocols that ensure the reliability and validity of alcohol tests conducted using breath testing devices. Furthermore, NHTSA is also involved in research and development in the field of alcohol measurement technology, contributing to the creation of uniform testing procedures and quality assurance measures.

Regulatory bodies such as the Federal Bureau of Investigation (FBI) and the Environmental Protection Agency (EPA) do not specifically oversee breath alcohol testing devices. While the FBI is focused on national security and federal law enforcement issues, the EPA is primarily concerned with protecting human health and the environment, not with alcohol testing in the context of driving or traffic safety. The National Institute of Standards and Technology (NIST) provides technical standards and measurements, but its involvement is more about establishing measurement standards than regulating the use of testing devices like the Intoxilyzer 8000 specifically. Thus, the NHTSA's role is what makes it the appropriate regulatory agency in this context.