Final answer:
States may leave it up to cities and counties to determine requirements for private security guards due to cities and counties having more autonomy, a better understanding of local law enforcement and the ability to establish partnerships with police.
Step-by-step explanation:
Some states leave it up to cities and counties to determine requirements for private security guards for a few reasons. First, cities and counties have more autonomy in their decision-making processes compared to the state government. This allows them to tailor the security requirements to the specific needs of their community. Second, cities and counties often have a better understanding of the local law enforcement landscape and can set stricter regulations for private security guards to ensure public safety. Lastly, cities and counties may have established partnerships and collaboration between police and security forces, allowing them to share duties and resources effectively.