"He who does not think himself worth saving from poverty and ignorance by his own efforts, will hardly be thought worth the efforts of anybody else." -- Frederick Douglass, Self-Made Men (1872)
Functional magnetic resonance imaging - Wikipedia, the free encyclopedia
In essence, a brain scan to buy a gun.
And yes if there had been a well armed citizen on the streets at that hour, they could of stopped this guy cold.
"The problem in defense is how far you can go without destroying from within what you are trying to defend from without."
~Dwight D. Eisenhower
Lastly, the measures would only stop people with character and personality disorders from obtaining a legal gun. They could seek out the illegal market. But then they risk being captured and jailed for that.
With the lack of such a research though I could state that such policies would only allow people with personality and character disorders whom obtained an illegal gun to continue on with their ill intend and commit murder. How much exactly such a percentage is would involve your current number of: psychopaths, sociopaths, mass murderers, implicit murderers, and paranoid schizophrenics, their average kill, and then an estimated drop from there.
For more details apply background checks with fMRI and let us do some research to provide you with final data results. If you then do not like it you can change the policy. It is not like you shall be stuck with it for all eternity!
Driving a car also requires one to have a license. Known terrorists cannot enter a plane probably, so there should be some policy about background checks for getting a plane ticket also.
But the way I see it the brain scanning technology would be involved for all that and a lot more. If only and ONLY it was portable. That is the ultimate pragmatic fallacy. You cannot carry an fMRI with you while doing those and other things even if one wanted to.
Besides, fMRI technology is not quite there yet at reading your mind. Findings are more strongly about emotional, and mental states, as well as in disorders. Otherwise cognitive work is mostly done in the upper most thinner layers of the brain who are way too narrow to assign a function per thought yet for most part.
Thus no one may not know what you are thinking. But sure as heck they may know whether you: like, dislike, fear, irritate, or angers you.
Bartender: WCH, want a beer? (looks at your brain scans). Ok, then, which will it be, a Bud or Peja? (looks again). Peja is exported beer from Dardania? No! Ok, here's a Bud. 5$ . Yes, you heard me! Now don't give me that amigdala activity BS! It is 5$ and I opened the bottle! Ok, ok. But I will put it in your tab! I see you like that you cheap bastard!