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<p>A laboratory urine drug test is when a urine specimen is sent to a lab for more accurate testing for determination of the contents of the specimen. Proper collection procedures,<a href="/resources/glossary/define-chain-of-custody-coc">Chain of Custody (<abbr title="Chain of Custody">CoC</abbr>)</a> procedures and transportation guidelines must be followed as outlined in the Code of Federal Regulations (<abbr title="Code of Federal Regulations">CFR</abbr>).</p>

