Section 83. Application of article

Nothing in this article shall apply to
  any detective or officer belonging to the police force of the state,  or
  any  county,  city, town or village thereof, appointed or elected by due
  authority of law, or to any person in the employ of any police force  or
  police  department of the state, or of any county, city, town or village
  thereof while engaged in the performance of their official  duties;  nor
  to   any   person,   firm,   limited   liability  company,  partnership,
  corporation, or any bureau or agency, whose business is exclusively  the
  furnishing of information as to the business and financial standing, and
  credit  responsibility  of persons, firms, or corporations, or as to the
  personal  habits  and  financial  responsibility   of   applicants   for
  insurance,  indemnity  bonds  or commercial credit or of claimants under
  insurance policies; and whose business does not embrace other activities
  described in section seventy-one of this article; or whose  business  is
  licensed  by  the  commissioner of labor under the provisions of section
  twenty-four-a or subdivision three-b of section fifty  of  the  workers'
  compensation  law  or whose business is representing employers or groups
  of employers insured under the workers' compensation law  in  the  state
  insurance  fund;  nor to any corporation duly authorized by the state to
  operate a central burglar or fire alarm protection business; nor to  any
  person  while  engaged  in  the  business  of  adjuster for an insurance
  company nor to any public adjuster licensed  by  the  superintendent  of
  insurance  under  the insurance law nor to any person regularly employed
  as special agent, detective or investigator exclusively by one  employer
  in  connection  with  the  affairs  of  that  employer  only  nor to any
  charitable or philanthropic society  or  association  duly  incorporated
  under  the  laws  of the state and which is organized and maintained for
  the public good and not for private profit, nor shall anything  in  this
  article  contained  be  construed  to  affect  in  any  way attorneys or
  counselors at law in the regular practice of their profession, but  such
  exemption   shall   not   enure  to  the  benefit  of  any  employee  or
  representative of such attorney or counselor at law who is not  employed
  solely,  exclusively and regularly by such attorney or counselor at law.
  No person, firm, limited liability company, partnership, corporation  or
  any  bureau  or  agency  exempted hereunder from the application of this
  article  shall  perform  any  manner  of  private   investigator,   bail
  enforcement  agent or watch, guard or patrol agency service as described
  in section seventy-one of this article,  for  any  other  person,  firm,
  limited  liability  company,  partnership, corporation, bureau or agency
  whether for fee, hire,  reward,  other  compensation,  remuneration,  or
  consideration or as an accommodation without fee, reward or remuneration
  or  by  a  reciprocal arrangement whereby such services are exchanged on
  request of parties thereto. The commission of a single act prohibited by
  this article shall constitute a violation thereof.
    Nothing in this article shall be construed to affect or  prohibit  the
  right  of any person to form or become affiliated with or to continue as
  a member of any union, association, society or organization of  his  own
  choosing.