Why is it important to change gloves between collecting each piece of evidence?

Changing gloves between collecting each piece of evidence is crucial for DNA analysis because it prevents cross-contamination of samples. When investigators collect evidence, biological material such as skin cells, blood, and other bodily fluids can easily transfer from one item to another if the same gloves are used throughout the process. This contamination can significantly hinder forensic analysis and lead to inaccurate results, ultimately impacting the integrity of the investigation.

By using new gloves for each piece of evidence, investigators ensure that the DNA profiles obtained from samples are specific to the source intended for analysis, thus maintaining the chain of custody and the reliability of the forensic findings. This practice underscores the importance of meticulous evidence handling in criminal investigations, where the accuracy of DNA results can be pivotal in solving cases and securing convictions.