This essay presents the use-first-and-investigate-later (UFAIL) approach to technological use through two case studies: the atomic bomb in World War II and chemical defoliants during the Vietnam War. The methodology of UFAIL is as follows: despite limited understanding of an array of potential effects (medical, environmental, etc.), technology users employ a commitment to ex post facto investigations of these effects. In generalizing these cases, the essay argues (a) that failure to check rapid technological uptake will result in continued disaster and (b) the abatement of the negative consequences of UFAIL is a more tempered approach to the infiltration of technologies into society by rigorous and preemptive investigation into the potential effects of a technology. (Contains 6 notes.)