2015 New York Laws
AGM - Agriculture & Markets
Article 4 - (Agriculture & Markets) Dairy Products.
51 - Milk inspection.

 51. Milk  inspection.   The commissioner or his agent, in inspecting
  milk for the purpose of analysis to determine the percentage of  fat  or
  other  milk  solids, shall take duplicate samples thereof and shall seal
  both samples, and shall tender, and, if accepted, deliver one sample  to
  the person from whom the milk was taken. When samples are taken from the
  producer  of  the  milk  sampled or his agent, at a place other than the
  dairy where the milk was produced, the commissioner or his  agent  shall
  within  ten  days  thereafter,  with  the  consent of the producer, take
  duplicate samples of the mixed milk of the herd of cows from  which  the
  milk  first  sampled was drawn, and shall deliver one such sample to the
  producer or his agent and shall submit the other to  analysis.  If  upon
  analysis it proves to contain no higher percentage of milk solids, or no
  higher  percentage of fat, or has no lower freezing temperature than the
  sample first taken, then no action shall lie against  the  producer  for
  violation  of  standards  as established by the commissioner pursuant to
  the provisions of section forty-six-a. If the producer refuses to  allow
  such  herd sample to be taken, then the producer shall be precluded from
  offering any evidence that the milk from  which  the  first  sample  was
  taken  was just as it came from the cow. Where a sample of milk taken by
  the commissioner or his agent consists  of  the  entire  contents  of  a
  container  unopened at the time of taking, no duplicate need be taken or
  tendered or delivered.