Richard,
  My understanding for the reason for this definition is to close loopholes.
  If the amount of Pb was based on the total product weight, people may just pad the product weight in other ways to allow more Pb usage.
  It is unrealistic to expect someone to test an entire assembly to the complete homogeneous level on a regular basis, but it allows them to prosecute based on any one high Pb concentration area they may find.

  Regards.


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