> There are a lot of environmental toxins and any one of these could cause
similar effects. They don't look for those effects.

They isolated for the item under test using controls - they compared control
colonies with treated colonies, all exposed to the same environment.  The
only difference was the spiking of the supplemental feed syrup with 2 ppb
Imidacloprid for the treated colonies, the controls getting the same feed
with no Imidacloprid.  The supplemental feed was only 100ml per colony at a
time, so the feed was not a significant percentage of the total nectar
consumed by any colony. 

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