What should a handler do before beginning a building sniff with a K-9?

Before beginning a building sniff with a K-9, it is essential for the handler to secure all suspects and ensure the building is clear of hazards. This step is crucial because the safety of both the K-9 and any personnel involved in the operation must be prioritized. Securing suspects helps prevent any unexpected behavior that could pose a danger to the team or inadvertently interfere with the dog's working environment. Additionally, checking for hazards, such as loose items or dangerous substances, is vital to prevent accidents that could harm the K-9 or the handler during the sniffing operation. Ensuring these elements are addressed allows for a smooth and efficient search, minimizing risks and maximizing the K-9's performance.

Other options, such as ensuring the building is merely free of hazards or turning on airflow for ventilation, do not encompass the comprehensive safety measures needed before commencing the sniff. Conducting a general inspection could be part of the preparatory process, but it does not specifically address the essential step of securing the suspects.