sentences:  In their view, the U.S. government may find it hard in the future to object to other countries testing genetically engineered pathogens and novel delivery systems when they invoke their own national biodefense requirements.The Bush administration contended that the NBACC is purely defensive and thus its operations are fully legal and in accord with the BWC.A principle is that assessing the technical threat of biological pathogens is essential to inform and help develop biodefense policy.