Thorough tox reports require lots of effort. First off, labs try to collect at least 25 mL of heart blood, 10 mL of peripheral blood, and 50-gram tissue samples from the subject's brain, liver, and kidney. An analyst then carries out an alcohol screening and a generalized immunoassay test, which can detect broad-based drug groups like opiates or tranquillizers. In the event of a positive drug test, the analyst must complete a confirmation procedure, designed to ferret out the exact nature of the offending substance. Next, a supervisor reviews the analyst's report and either approves the conclusions or requests more tests. This whole process, barring glitches or lengthy tests for hard-to-detect drugs like neuromuscular blockers, could take just a couple of days ifanalysts were able to devote themselves exclusively to a well-preserved specimen. (They rarely get this opportunity.)
Source: http://feeds.slate.com/click.phdo?i=b14faf925566b4bbeb63be5a89a5fef0
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