What is a critical requirement when collecting evidence at a hazmat scene?

Following the chain of custody is a critical requirement when collecting evidence at a hazmat scene because it ensures that all evidence can be accounted for from the time it is collected until it is presented in court or used for investigations. The chain of custody documents who collected the evidence, how it was handled, and where it was stored at every stage. This process prevents contamination, tampering, or loss of evidence, which is essential for maintaining the integrity of the investigation.

Without a proper chain of custody, evidence may be called into question during legal proceedings, potentially undermining an investigation's credibility. This strict protocol is especially vital in hazardous materials incidents, where the implications may involve legal, regulatory, and environmental consequences.