Blockchain-based systems for firearms tracking could come in handy for the police as they potentially help prevent gang violence and child mortality. However, some state governments think it is unfair to force people to use that technology.
For example, the government of Arizona has developed a bill to prohibit the mandation of firearms tracking using blockchain. They think mandation of smart-gun technology might impose government tyranny upon those who use weapons. Besides, it might be used not only for the prevention of children mortality and gang violence, but for their own purposes.
The full article: https://coinidol.com/firearms-tracking-vs-government-tyranny/