Marijuana Plant (File)A major gun rights organization has formally asked the U.S. Supreme Court to step in on a growing legal conflict: whether the government can ban someone from owning a firearm for life simply because they use marijuana. On Thursday, the Second Amendment Foundation (SAF) filed legal documents supporting a challenge to the federal “lifetime ban” currently placed on marijuana users. The case, known as United States v. Hemani, centers on whether current federal laws violate the Second Amendment. In their filing to the Supreme Court, the group argues that the government is ignoring history. They point to recent court rulings that say gun laws must align with the nation’s historical tradition.