Federal drug testing.

I need to take a urine drug test within the next week or so for externship. I personally do not smoke weed but my fiance does and so does almost my whole family so it's really tough trying not to be around the smell. When they do smoke I try my best just to cover my nose so I don't smell it as much. Is there around such this as second hand smoke when it comes to Marijuana? I don't want to fail this drug test because I absolutely do not smoke. The drug trust is on a federal level too...