A person seeking treatment or rehabilitation for drug addiction or dependency shall first be examined and evaluated by a physician. Such a physician shall prescribe a proper course of treatment and medication, if needed. The treating physician may further prescribe a course of treatment or rehabilitation and authorize another physician or hospital to provide the prescribed treatment or rehabilitation services. Treatment or rehabilitation services may be provided to a person individually or in a group. Any hospital participating in such treatment or rehabilitation shall not report or disclose to a law enforcement officer or agency the name of any person receiving or engaging in such treatment or rehabilitation, nor shall any person receiving or participating in such treatment or rehabilitation report or disclose the name of any other person engaged in or receiving such treatment or rehabilitation, or that such a program is in existence, to a law enforcement officer or agency. However, any person engaged in or receiving such treatment or rehabilitation may authorize the disclosure of his name and individual participation.