What is the purpose of a control sample in forensic testing?

A control sample in forensic testing serves as a clean reference for comparison to help ensure the accuracy and reliability of the forensic analysis. When analyzing evidence, having a control sample allows forensic technicians to determine baseline measurements and assess the presence or concentration of a particular substance. This is crucial because it helps distinguish between actual evidence and any artifacts that may arise during the testing process.

By comparing test results from the control sample to the results from the unknown samples, technicians can effectively evaluate whether the substances present in the unknown samples are indicative of the evidence in question. This comparison is essential for ensuring that the conclusions drawn from the forensic analysis are valid and scientifically sound. The use of control samples enhances the integrity of the scientific method in forensic investigations and contributes to the overall credibility of the results.