This is a very difficult problem to solve, no doubt, and requires technological and political will. An alternative to current thinking around trigger protection schemes is to endow guns with some level of situational self-awareness (actually not unlike self-driving cars). Guns could include sensors, not unlike a two-way sight and other capabilities, to determine if it is about to be used for suicide, is being aimed at a child, or being fired in a school or movie theater by someone other than a law enforcement officer. I outlined these ideas three years ago in a CNN.com op-ed. All of these approaches are more complicated than trigger ID’s or fingerprint technology. However, they are more in-line with trends in sensor development. Even if this technology is feasible, it must also be marketable. Guns will only become “safer” overall — in reducing the chances they are used in a suicide or to harm children — if they appeal to a broad market. People might buy “sensor” guns on a larger scale if they are more accurate to hunt or to use in target practice, or if they are subsidized/required by home or life insurance underwriters.