"The court ruled unanimously that gun rights groups could not overturn the requirement by arguing it was impossible to comply with the law that supporters touted as a first in the nation. The groups argued that the technology did not exist, and a law could not mandate something that was not possible."
https://www.usnews.com/news/best-st...gh-court-tosses-suit-over-bullet-stamping-law
https://www.usnews.com/news/best-st...gh-court-tosses-suit-over-bullet-stamping-law