Although methyl bromide is a “poison”, it is a gas and leaves no residue one aerated. Pallets that are pre-2005 were long aerated in 2005, since the gas is very hard to contain (we have to seal a container with plastic, tape, and glue to make it as gas-tight as possible) and the pallet is de-gassed within hours of opening the container. Methyl bromide is also a naturally occuring chemical, with over 95% of what is in the atmosphere produced by the oceans, approximately 4+% produced by the burning of biomass (forest fires, etc.). In sufficient quanities (not much, but far much more than that in the atmosphere), it is dangerous. however, it is a restricted use pesticide and available only to certified, state-licensed personnel who must annually complete recertification to even use or purchase it. use those pre-2005 pallets! By the way, most pallets are not treated with methyl bromide or heat anyway, only those used for export to certain countries.