Pensions and Retirement Benefits - As enacted, requires retirement credit established for a period of disability for a commissioned member of the department of safety or agent of the Tennessee bureau of investigation to be at no cost to that member; authorizes political subdivisions that pass a resolution to establish retirement credit for its employees to allow the credit for a period of disability for any member who is subject to mandatory retirements to be at no cost to such person. - Amends TCA Title 8, Chapter 34, Part 6.