(b) Controlled substances may be administered to narcotic addicts or habitual users of controlled substances upon the order of a person authorized by law to practice medicine or osteopathy in this State and who possesses a Federal registration by the Drug Enforcement Administration, United States Department of Justice, authorizing him to use controlled substances in connection with his professional practice as follows:

1. (1) for bona fide patients suffering from disease known to be incurable, such as cancer, advanced tuberculosis, and other diseases well recognized as coming within this class;

2. (2) for addicts who are aged and infirm, or severely ill and it is determined that withdrawal of controlled substances would be dangerous to life, provided that:

   1. (i) such determination has been confirmed by adequate consultation;
   2. (ii) complete records of treatment, administration or dispensing of controlled substances including patient's name, date and type and quantity of controlled substance administered or dispensed are kept;
   3. (iii) adequate safeguards have been taken against diversion of the controlled substances from the intended use; and
   4. (iv) the patient is carefully supervised;

3. (3) to relieve acute withdrawal symptoms, except that:

   1. (i) only the amount of controlled substances essential for relief of such acute symptoms shall be administered; and
   2. (ii) administration shall be in an institutional or other setting reasonably certain to provide a drug-free environment;
4. (4) for detoxification of an addict participating in an authorized treatment program approved pursuant to article 23 of the Mental Hygiene Law; and
5. (5) for treatment of addicts participating in an authorized methadone or other controlled substances maintenance program approved pursuant to article 23 of the Mental Hygiene Law.