Which of the following is NOT a trend affecting a facility's prohibited items?

The focus of the question is to identify a trend that does not directly influence the list of prohibited items at sports facilities. Clear bag policies, drones, and selfie sticks are all trends that have emerged in recent years, impacting how facilities manage security and the items that spectators can bring.

Clear bag policies have been implemented to enhance security and streamline entry processes, limiting the types of bags fans can carry. This directly affects what items are allowed into the facility. Drones, due to safety and privacy concerns, are often strictly prohibited at events, as they could pose risks to both spectators and athletes. Selfie sticks have also been restricted in many venues because they can become unwieldy and pose safety hazards.

In contrast, the use of metal detectors is a security measure aimed at screening attendees for prohibited items, rather than a specific trend affecting what items can actually be brought into the facility. Metal detectors are tools used to enforce security policies but do not change the list of items that are considered prohibited. Therefore, while they contribute to overall safety and security, they do not represent a change in the categorization of items allowed versus prohibited.