(a) Notwithstanding the provisions of sections 21a-422p to 21a-422r, inclusive, nothing in RERACA shall be construed to apply to drug testing, conditions of continued employment or conditions for hiring employees required pursuant to:

(1) Any regulation of the federal Department of Transportation, if such regulation requires testing of a prospective employee in accordance with 49 C.F.R. § part 40 or any regulations of state agencies that adopt a federal regulation for purposes of enforcing the requirements of such regulation with respect to intrastate commerce;

(2) Any contract entered into between the federal government and an employer or any grant of financial assistance from the federal government to an employer that requires drug testing of prospective employees as a condition of receiving the contract or grant;

(3) Any federal law or state statute, regulation or order that requires drug testing of prospective employees for safety or security purposes; or

(4) Any applicant whose prospective employer is a party to a valid collective bargaining agreement that specifically addresses drug testing, conditions of hiring, or conditions of continued employment of such applicant.

(b) Nothing in sections 21a-422p to 21a-422r, inclusive, shall apply to the privileges, qualifications, credentialing, review or discipline of nonemployee, licensed healthcare professionals on the medical staff of a hospital or other medical organization.