So if bees are so highly sensitive to non-biologically relevant odors 
and so easily trained to them, how do you work through protocols to 
avoid contamination and mis-signals from operators, equipment, 
participants in the trials? 

Last fall we had a serious water deficit in the high desert.  There are 
extensive stands of rabbit brush near our house.  They bloomed but did 
not secrete nectar.  I prepared sugar syrup in a small storage shed for 
a few colonies on our rooftop (bears...).  There is beekeeping 
equipment, tools, stored junk in there, and smokers...  Foragers, I 
assume searching in the rabbit brush, would find me and buzz around up 
to half a mile from the house.

 

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