From Ammoland:

The government tried to use laws from the founding era that disarmed people who felt they were dangerous. One example that was given is the banning of British Loyalists from having firearms. The judges rejected that argument, stating that the ban on marijuana users owning firearms would be more akin to the founders banning people who drank alcohol from owning guns. The judges pointed out that the founders drank copious amounts of alcohol. The judge stated the government may be able to prevent someone who is intoxicated from carrying a firearm. Still, Ms. Connelly was not under the influence of drugs at the time of the arrest and was not a dangerous person.