Preserving and securing a crime scene in NSW involves taking proper measures to ensure the safety of everyone involved and the preservation of evidence. The first priority is to ensure the safety of all individuals present and secure the area to prevent contamination or disturbance of the evidence. This can be done by establishing a perimeter, limiting access to the scene, and designating specific entry and exit points.

Evidence collection is critical, and only trained technicians should handle physical evidence. They must follow the correct procedures for collection and storage. Documentation is also important, and every detail should be recorded, including the temperature of the environment, odours, lighting, and any evidence of forced entry.

DNA evidence can be obtained through procedures outlined by the National Association of Testing Authorities Australia (NATA) requirements. Individuals may apply to the local police service or Director of Public Prosecution to obtain access to evidence.

Security personnel at a crime scene have limited entitlements. They may assist in securing the scene, but their actions are subject to the direction of the police or other authorized law enforcement personnel. They do not have the right to detain or frisk individuals or control people’s movements unless specifically authorized by the police or other law enforcement personnel.