I had a similar situation. I had a bad break up and smoked one joint one weekend with a friend. I was not addicted to any substance. Made a mistake at work which lead to a UDS. It came back positive. I was fired and reported to the BON. I was given three options. Go to rehab and join that program, surrender my license for no less then a year, or be investigated. I choose to surrender. After a year where I lost everything I had a reinstatement meeting with the board where I was placed on probation. Quickly started working while being tested randomly and my manager had to fill out paperwork every three months on how I was doing. I finally finished probation 13 months later. My license now has discipline listed for now on.