> I also wonder if the breakdown components exist in old combs and can they 
> show up in extracted honey in parts per billion to this day?

From 
http://www.culturaapicola.com.ar/apuntes/revistaselectronicas/apidologie/32-6/floris.pdf

No residue higher than 0.01 mg.kg-1 was detected in honey. Even in other 
studies, in which amitraz as administered by aerosol, very low or no 
residues were found (Avila et al., 1990; Lodesani et al., 1992; Fernandez et 
al., 1997). For instance, in East Germany, out of 330 honey samples analysed 
in 1986-1990, only 8.5% them contained more than 0.05 mg of amitraz.kg-1 
(Hemmerling et al., 1991). The low residue values, generally determined in 
honey even when
amitraz is directly administered in the hive, are probably due to its fast 
degradation (2-4 weeks) (Jiménez et al., 1997). 

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