Cocaine in monkey whiz? (Fake urine)?

So my friend accidentally posted a video on his Snapchat story of him and my sister smoking weed and his boss saw it and so he had to take a drug test. He already had monkey whiz which is this fake urine you can buy from a head shop. He gets to the testing center and he uses the fake urine but cocaine shows up.... show more So my friend accidentally posted a video on his Snapchat story of him and my sister smoking weed and his boss saw it and so he had to take a drug test. He already had monkey whiz which is this fake urine you can buy from a head shop. He gets to the testing center and he uses the fake urine but cocaine shows up. Mind you he’s never used cocaine and plus he used the fake urine. They ended up sending the fake urine to a lab so either way he’s screwed because they’ll find out it’s not real urine but what I don’t understand is why cocaine would be detected in store bought piss. It’s an anomaly! Can anyone explain this to us?
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