law: Environment (Protection) Act, 1986  
  11. Power to take Sample and Procedure to be followed in Connection there with
  
  (1) The Central Government or any officer empowered by it in this behalf, shall
  
  have power to take, for the purpose of analysis, samples of air, water, soil or
  
  other substance from any factory, premises or other place in such manner as may
  
  be prescribed.
  (2) The result of any analysis of a sample taken under sub-section (1) shall
  
  not be admissible in evidence in any legal proceeding unless the provisions of
  
  sub-sections (3) and (4) are complied with.
  (3) Subject to the provisions of sub-section
  
  (4), the person taking the sample under sub-section (1) shall -
  (a) serve on the
  
  occupier or his agent or person in charge of the place, a notice, then and
  
  there, in such form as may be prescribed, of his intention to have it so
  
  analyzed;
  (b) in the presence of
  
  the occupier or his agent or person, collect a sample for analysis;
  (c) cause the sample to be placed in a container or containers which shall be
  
  marked and sealed and shall also be signed both by the person taking the sample
  
  and the occupier or his agent or person;
  (d) send without
  
  delay, the container or the containers to the laboratory established or
  
  recognized by the Central Government under section 12.
  (4) When a sample is taken for analysis under
  
  sub-section (1) and the person taking the sample serves on the occupier or his
  
  agent or person, a notice under clause (a) of sub-section (3), then, -
  (a) in a case where
  
  the occupier, his agent or person willfully absents himself, the person taking
  
  the sample shall collect the sample for analysis to be placed in a container or
  
  containers which shall be marked and sealed and shall also be signed by the
  
  person taking the sample, and
  (b) in a case where
  
  the occupier or his agent or person present at the time of taking the sample
  
  refuses to sign the marked and sealed container or containers of the sample as
  
  required under clause (c) of sub-section (3), the marked and sealed container
  
  or containers shall be signed by the person taking the samples, and the
  
  container or containers shall be sent without delay by the person taking the
  
  sample for analysis to the laboratory established or recognized under section
  
  12 and such person shall inform the Government Analyst appointed or recognized
  
  under section 13 in writing, about the willful absence of the occupier or his agent
  
  or person, or, as the case may be, his refusal to sign the container or
  
  containers.