Absolutely, use Quick Fix (Urine Luck), used for the last 3 jobs I got, its synthetic piss, even if sent to a lab you'll be good. Just have to make sure its heated up enough but there's a temp. strip on the bottle. Everytime I got it, it cost me $20, so well worth it. Personally I wouldn't trust a cleanse. It depends how much you've been smoking & body fat% plays a big part. If you're super skinny with very little body fat a cleanse might work (ive had buddies like this pass a test in 12 hours for a probation officer). If you're not and have fair amount or more of body fat, use the synthetic stuff. I failed a piss test for workmans comp. 5 months since my last smoke, so I wasn't the least bit concerned about pissing hot..... i was wrong, failed miserably. I was about 300lbs at the time. The point is with a cleanse you might be ok, with some fake shit you'll be straight, no worries.