Do test strips remove THC metabolites from urine? It might sound goofy, but if they do, could you use a whole bunch of them to remove THC from urine that may still have some in it to substitute with?
Think about the ludicracy surrounding your question - if test strips removed THC metabolites from the urine, then how come cannabis users can (and do) test THC-positive on an assay?


About the only thing that can permanently rid THC metabolites from the urine sample are drop-in adulterants (i.e. bleach, acids, commercial additives). But labs are detecting these products on a regular basis and are not recommended.

If you want to sub, just find someone who is clean, or use synthetic.