Which act enables physicians to receive a waiver from special registration requirements for medication-assisted opioid therapy?

The Drug Addiction Treatment Act of 2000 is the correct response because it specifically allows qualified physicians to obtain a waiver to prescribe certain controlled substances for the treatment of opioid addiction without needing to meet the stringent registration requirements typically associated with these medications. This act recognizes the need to support healthcare providers in managing and treating patients with opioid dependence, facilitating access to medication-assisted treatments while ensuring that practitioners have appropriate training.

The other options pertain to broader regulations around controlled substances and drug abuse prevention but do not specifically address the waiver for medication-assisted therapy. For example, the Controlled Substance Act regulates the federal policy regarding the control and distribution of substances, while the Comprehensive Drug Abuse Prevention and Control Act provides the framework for the regulation of all drugs capable of causing dependence. The Substance Abuse and Mental Health Services Act promotes treatment programs and services but does not include the specific provisions for waivers related to opioid treatment offered by the Drug Addiction Treatment Act.