Psychological testing as a requirement for a carry permit?
If they're going to rely on pseudoscience that can easily be influenced by politics, why not base it on a favorable horoscope, the lines on one's palms, or a professional Tarot card reading?
Or for that matter, if "neighbors" are being interviewed to deem whether a person is fit to carry a gun, how about this: If five or more persons come forward expressing opposition to a person going about armed, that person is prohibited from carrying a gun. No exceptions for sheriffs.