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Hi, thanks for the question
Baking soda could change the pH of your urine. This could render a sample useless for testing. However, most labs have measures in place to detect this and many other methods of "cover up." Basically, it won't give you a clean test, but possibly an invalid one. You would have to repeat it, and if they have measures in place to detect it, they will not retest and consider it "cheating."...the same as if the sample were positive. They even measure concentration and can detect when it's been too diluted (drinking way too much water).
The bottom line is that the only real way to get a clean test is time.
Thanks so much for the question!
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