I don't know about the United States but here in Quebec the state department of agriculture has started analysing bees with a lab test that can detect residues of around 200 different pesticides. The results of the tests are sent to Health Canada who then release an incident report with their conclusions. Here's an example of such a report:
http://www.hc-sc.gc.ca/cps-spc/pubs/pest/_decisions/erc2010-4374/index-eng.php
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