a pesticide so powerful that the u.s. government made it illegal to use indoors in the u.s. and its territories. but authorities believe a delaware family was exposed to methyl bromide when a pest control company fumigated a condo below theirs at a report. senior medical correspondent elizabeth cohen is here. elizabeth, when you lay out these facts, it's scary to anyone who's been going on vacation. no way for this family to know. now they've all been in the hospital, the two sons still in a coma. talk to me about the effects this chemical has on the body and the potential for any long-term impacts. >> this chemical is highly, highly toxic. you just need to be exposed to it for two hours to have ill effects. it can start with vomitsing, go