Our expert says:
The substance ? It depends on which substance, and if you know its name ( preferably its chemical name ) you could do a google search and look it up. And it depends on whether the lab doing the urine test is looking for that particular substance, as they obviously can't look for everything every time they test urine.
If you are referring to substance abuse, and your son taking something he should not be taking, he should be nder treatment from a proper clinic / expert in that area, who could tell you what's the best interval for such testing. And whatver lab is doing the tests could also advise, as results sometimes depend on the specific method they use
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