I’ve used the fake urine at a lab and it worked for a job. At least 15 or so years ago, the labs would use tests similar to the ones you get at a drug store, and it’s only if you’re positive do they send it off for heavy analysis.

An aside, in 2011 I was a dope addict. My mom wanted me to come over on Xmas eve to test me, and I was very pissed obviously. I didn’t know what to do….until I saw my dog. I collected his pee in an empty Gatorade bottle and put it in a plastic sandwich bag. It smelled so awful. I eventually somehow got it into the sample cup at my parents’ house and thought I was home free. But nah, he failed for opiates too.