An anonymous reader writes: Engadget takes a look at smart gun technology currently available and what the future might hold. From the article: 'While the idea of a gun that couldn't be turned on its owner seems like an obvious win for everyone involved, there are a number of problems with the concept. Chief among those worries: the safety mechanism will fail when it's needed most. If you're relying on a weapon for defense, the last thing you want is another avenue for failure. Electronics aren't perfect. Sometimes cameras can't autofocus. Cable boxes freeze up when browsing the channel guide. The equivalent, seemingly small glitch in a smart gun could be the difference between life and death.'