I am a very rare MJ user due to lack of availability. Digging around in and cleaning out a drawer, I came across sone old dried out MJ. I used a one-hitter a couple of times 2 days ago hoping for pain relief. The MJ was very weak, barely felt any effect, and what little I felt wore off within less than 30 minutes. I had an unexpected urine drug screen when I went to an ER for severe pain treatment. How likely is it that the drug screen would come up positive? I am a female 5’4″ 165 lbs.