General Discussion
In reply to the discussion: Lt. Col. Joni Ernst broke the law by signing the seditious letter to Iran. [View all]I am very familiar with a number of prosecutions under state level UCMJ actions for events that took place "off duty" and "off post".
I know of certain soldiers who were prosecuted and discharged under state UCMJ actions for drug use while off duty. And for domestic violence, which then negated their qualification to carry weapons, which ended up being prosecuted for disobeying an order. It's also actually quite common to order someone to active duty on state orders in order to prosecute them under UCMJ for "missing a movement", if they failed to report to duty when originally ordered.
It happens all the time. Yes, you are technically subject to being ordered to duty to face charges for events that could have happened when you were not on duty. But again, each case has to be examined, and the chain of command has to decide whether or not to order them to trial, or to let civil courts handle everything.