(1) That the retiring deputy is retiring honorably with at least twenty years of service; or
(2) The retiring deputy is retiring with less than twenty years of service based upon a determination that the deputy is totally physically disabled.
(b) Notwithstanding the provisions of subsection (a) of this section, a sheriff shall not award his or her service pistol to any retiring deputy medically determined to be mentally incapacitated or to constitute a danger to self or others.