Which action is commonly used to enforce facility rules?

Conducting random searches for contraband is a proactive measure commonly used in correctional facilities to ensure the safety and security of the institution. This action allows jail officers to monitor the environment and prevent inmates from possessing prohibited items that could lead to contraband-related incidents, such as violence or escape attempts. By regularly searching areas and inmates, officers reinforce the facility's rules and demonstrate that noncompliance will not be tolerated. This approach not only deters rule-breaking behavior but also helps maintain order within the facility.

In contrast, the other options focus on methods that may not be as effective alone for enforcing facility rules. Allowing inmates to self-govern could lead to a breakdown in control and order, while issuing formal warnings for all infractions may lead to a lack of severe consequences for rule violations. Creating an inmate council might offer a platform for discussion and representation, but it does not necessarily enforce the rules or deter misconduct in the facility. Therefore, random searches represent a direct and effective enforcement strategy.