(a) A person may not be considered for participation as a recipient of tetrahydrocannabinols and their derivatives through a research program unless the person is recommended to a person in charge of an approved research program and the review board by a physician who is licensed by the Texas Medical Board and is attending the person.
(b) A physician may not recommend a person for the research program unless the person:
(1) has glaucoma or cancer;
(2) is not responding to conventional treatment for glaucoma or cancer or is experiencing severe side effects from treatment; and
(3) has symptoms or side effects from treatment that may be alleviated by medical use of tetrahydrocannabinols or their derivatives.