Employers mandate workplace drug tests, with the caveat that the results aren’t foolproof. The Internet abounds with workarounds or questionable methods that might alter the results of a urine test; other times the tests themselves are faulty, producing false positives or negatives. A new technique uses a sample of exhaled breath instead.In the traditional mass spectrometry urine test, molecules in a sample are given a charge then separated out by their weight so that they can be identified by their unique spectral signature. A researcher doing mass spectrometry can check a urine sample for…
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