ANSWERS: 2
  • it is possible that other drugs or substances gave him a "false postive." Ask for a re-test. +5
  • Different tests have different false positive rates, example, in one study the ELISA method produced false positive results in about 21% of the cases.* Some substances will cause a false positive such as eating poppy seeds on a bagel. Ask for a retest using a different method. *http://linkinghub.elsevier.com/retrieve/pii/S0379073804002105

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