I'm with you on this one, Jim. Some of these accusations seem wildly illogical to me.
Of course, if I were among the scientists actively researching CCD, I would check the possibilities of even some of these wildly-illogical explanations. Like you've pointed out, detecting chemical residues in hives is fairly simple with modern methods, and the researchers seem to have checked for various pesticides or other contaminants. I give them the benefit of the doubt, and assume that if such things enter my mind, the same ideas are likely to occur to the researchers, and they're likely to have already checked for them.
In my opinion, continuing to insist that pesticides may be responsible for CCD is an insult to the teams researching CCD. Neonicotinoids have come up in many circles; if the researchers have checked for neonicotinoids and found nothing, it's insulting to keep harping about neonicotinoids. If the researchers haven't checked for neonicotinoid contamination, they deserve the insult. I have to believe that they're aware of it, though, and have already examined the possibility.