To substantiate claims in a report means to:

Substantiating claims in a report means providing proof or evidence that supports your assertions. In police report writing, it is essential to back up statements with factual information, witness accounts, physical evidence, or relevant details that can corroborate what has been claimed. This ensures the report holds credibility and can be trusted by other law enforcement entities or in court proceedings.

Providing proof is fundamental in law enforcement documentation as it validates the actions taken and decisions made. Whether it's citing specific observations during an incident, including witness statements, or referencing physical evidence gathered at the scene, the aim is to create a comprehensive and credible account of the facts. This practice helps maintain the integrity of the report and serves as a reliable resource for future reference.