authorities would like to see done. >> is it possible for someone who is not a trained crash investigator, will they be able to hide the evidence and know what to look for? >> it's more a question here of the possibility of tainting evidence. on the one hand, there's the technical oppone technical components to the investigation, but there's also a legal component. you want to do a grid search, photographing, logging everything, paper logging of everything. you have the concern of seeing tainting of evidence. pieces of evidence being removed. bodies being removed. it's going to be extremely difficult for any kind of clear resolution saying this is exactly what happened and this is the party responsible. >> the flight data recorders, a