How to sneak urine into a drug test ?

So it’s not for me as I don’t smoke marijuana. My husband is a CDL driver and just was informed he has to take a drug test today. He is a heavy smoker and has no time to detox etc. so do you ladies or your boyfriends or husbands have any experience with successfully sneaking in clean urine to a drug test? We are in Las Vegas ...marijuana is legal here but it’s not federally legal and he has a medical card for it and that doesn’t matter either . Help? ! No judgment please ! Thank you!!