Which of the following is NOT a permissible use of force by security personnel?

Preventing a lawful arrest by a police officer is not a permissible use of force by security personnel because it directly undermines the authority of law enforcement and disrupts the legal process. Security officers are trained to cooperate with and support police actions, not to interfere. When an officer is conducting a lawful arrest, it is their duty to ensure that the legal proceedings are respected. Any attempt to prevent such an arrest could lead to legal repercussions for the security officer and could compromise both public safety and the enforcement of the law.

In contrast, the other options describe situations where force may be reasonably employed. Defending oneself or another person is justified, as personal safety is a fundamental concern. Terminating a criminal trespass is permissible because security personnel have a responsibility to protect property. Additionally, making a citizen's arrest, when appropriately executed, aligns with the authority granted to individuals under certain legal exemptions.