Why are control samples essential in forensic testing?

Control samples are fundamental in forensic testing as they provide a baseline for comparison against evidence samples. This comparison is crucial because it allows forensic analysts to determine whether the evidence collected matches or differs significantly from known standards. By using control samples, scientists can assess the accuracy and reliability of their test results.

For example, if analyzing a biological fluid found at a crime scene, a control sample from a known source allows forensic experts to identify the characteristics specific to that fluid type. This can aid in confirming or ruling out potential sources of evidence. The presence of control samples also helps in validating the methods used during the examination, ensuring that any conclusions drawn from the evidence are based on solid scientific principles.

In contrast, while control samples may indeed help to confirm identities, they do not necessarily confirm the identity of all suspects or increase the quantity of evidence collected. Additionally, cost considerations do not outweigh the critical roles control samples play in ensuring the integrity and reliability of forensic analysis.