Section 208-D*3. Extra work by members of a police force in cities

Notwithstanding the provisions of any general, special or local  law  or
  any  rule or regulation of any police department or commissioner or head
  thereof, any member of a police force of a city may engage in extra work
  for another employer outside his regular hours of duty for not exceeding
  twenty hours a week provided that such extra work does not interfere  or
  conflict  with  his  regular  duties  as  a  member  of the force or his
  availability for emergency duty nor affect his physical condition to the
  extent that it impairs his ability to efficiently  perform  such  duties
  and further provided that the type of employment shall first be approved
  by the appropriate police department or police commissioner.
    * NB There are 3 § 208-d's