What purpose do control samples serve in forensic analysis?

Control samples play a crucial role in forensic analysis by providing a baseline for comparison to validate test results. They are essential for ensuring the reliability and accuracy of the forensic tests conducted. By using control samples, forensic analysts can determine whether the experimental conditions are functioning as expected and whether the results obtained can be attributed to the substance being tested rather than a result of contamination, environmental factors, or test malfunction.

For example, in a drug analysis, a control sample containing a known quantity of a specific drug can be tested alongside an unknown sample. If the test results of the unknown sample are consistent with the results obtained from the control sample, it indicates that the test is likely valid. This comparison is vital for establishing the credibility of the forensic findings, which, in turn, influences the legal outcomes based on that evidence.

The other options do not accurately reflect the role of control samples in forensic analysis. They do not create confusion, increase the amount of evidence, or focus on evidence storage. Instead, their primary function is centered around validation and reliability in testing results.