A researcher that finds considering a drug as an interruption or disorder of physiological functions as most useful for understanding drug addiction likely would prefer the disease model of drug addiction.
Addiction is a chronic dysfunction of brain systems involved in reward, motivation, and memory. It's about how your body craves substances and actions. When you become addicted, your brain's receptors are overwhelmed. The brain responds by either reducing dopamine production or eliminating dopamine receptors.
These changes affect a person's behavior, causing them to lose control over substance use and behavior. Addiction is not technically considered a mental illness, but it is a medical disorder that often coexists with mental illness.
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That would be the legislative branch, I hope this helps!