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SWIM knows people who have to take regular drug tests... SWIM used to hydrate like crazy the morning of a drug test, drinking a liter of water every 30 minutes or so to the point SWIM was pissing basically clean water.
See SWIMS other thread on hydromorphone and drug tests and SWIM posted some very useful information there. Check the list of metabolites that they commonly check for SWIM posted, and check to see if demerol metabolizes into any of those. If not, unless they do a specific test for it, SWIYS in the clear.