Sec. 2. It is lawful to prescribe, dispense, or administer controlled substances for the treatment of drug abuse if the following conditions are met:
(1) The controlled substances are used for the treatment or maintenance of a drug abuser.
(2) The treatment or maintenance is medically indicated.
(3) The treatment or maintenance is prescribed by a physician as a part of a rehabilitation program approved by the director and dispensed in compliance with the regulations for the dispensing of controlled substances.