Which substance is NOT classified as a controlled substance?

The classification of substances as controlled drugs is regulated by federal and state laws due to their potential for abuse, dependence, and legal regulation. In this scenario, the question is asking to identify a substance that is not a controlled substance.

Buprenorphine is an opioid used for the treatment of opioid addiction and is classified as a Schedule III controlled substance. Butalbital is a barbiturate often used in combination products for migraine headaches and is classified as a Schedule III substance as well. Testosterone, although it is a hormone used for various medical conditions, is classified as a Schedule III controlled substance due to the potential for misuse and abuse in the context of anabolic steroid trafficking.

Given that all the substances listed are classified as controlled substances, the assertion that "none of the above" are uncontrolled is consistent with the regulations. Therefore, the correct answer reflects that all listed substances are, in fact, controlled. Recognizing how each substance's legal scheduling impacts their prescription and dispensing is crucial for pharmacists and healthcare providers.