Which entity is exempt from registration with the DEA?

Federal agencies such as the U.S. Army are exempt from registering with the DEA due to their unique status as government entities involved in national defense and security. These agencies operate under specific federal regulations that do not require standard registration processes that apply to most private practitioners and facilities. This exemption exists because federal agencies have their own mechanisms and guidelines for handling controlled substances, which are distinct from those established for civilian healthcare providers.

The other choices involve entities that typically need to register with the DEA to handle controlled substances. Private healthcare clinics usually operate independently and must adhere to DEA regulations for their practice. Nursing homes, while they may have specific provisions regarding the use of controlled substances, generally require registration due to their role in providing medical care. State governments, similarly, do not fall under the exemption category, as they manage healthcare operations along with the corresponding obligations under federal law. This distinction clarifies why federal agencies like the U.S. Army maintain an exemption.