Given that we have good evidence that this technology is safe and remarkably effective, is it ethical to NOT deploy this technology on those government executives on whose decision-making and information-processing ability American lives depend?
You should do some research before claiming that there isn't evidence for something. If you look at the wikipedia article on tDCS, you'll find a number of peer-reviewed citations regarding its safety and efficacy.
Given that we have good evidence that this technology is safe and remarkably effective, is it ethical to NOT deploy this technology on those government executives on whose decision-making and information-processing ability American lives depend?