Under what circumstance can a collector take a second urine sample?

A collector can take a second urine sample if the first sample is too dilute or adulterated because maintaining the integrity of the testing process is crucial for accurate results. A dilute sample may indicate that the donor has consumed excessive fluids, leading to a lower concentration of the substances being tested. This could compromise the validity of the results. Similarly, an adulterated sample—one that has been tampered with or has foreign substances—may lead to misleading outcomes. In such situations, the testing protocol allows for the collection of a second urine sample to ensure that reliable and conclusive results can be obtained. This procedure is part of the standard practices to uphold the reliability and credibility of the testing process.