Which steps should be taken to secure a crime scene at an airport?

To secure a crime scene at an airport effectively, preserving evidence and restricting access to authorized personnel is crucial. This ensures that any potential evidence is maintained in its original state, preventing contamination or alteration that could compromise the investigation. By limiting access to only those who are trained and authorized, it minimizes the risk of interference, which can happen when untrained individuals enter the scene.

Moreover, this action helps maintain the integrity of the investigation. In an airport environment, where crowds and media attention can quickly escalate, establishing a controlled perimeter around the scene allows investigators to work efficiently without distractions or disruptions.

The other options do not adhere to proper procedures for securing a crime scene, which is vital for gathering accurate and usable evidence for any subsequent investigation and legal processes.