Ok. I used to be an avid marijuana smoker. I have been clean for 30 days, I have taken a detox kit that lasted 25. Since I started going clean I have been working out twice a day m-f lifting and running and saturday running. I am on a fat burner and b12.

Your question? After a month your urine is very likely to be clean but there are cases of outliers. Ask your doctor to screen you urine and then you'll know for sure.
If . If you were a heavy marijuana user it could take two months before the metabolites of marijuana are at a low enough level that it is not picked up on a urine drug screen. There are cases where it has taken longer. Good luck as you are working toward better health- however a 40 pound weight loss in 30 days may be a little bit extreme.