For which situation is a body cavity search most likely to be authorized?

A body cavity search is most likely to be authorized when there is probable cause and medical staff is present. This is because body cavity searches are highly invasive and carry significant privacy and legal implications. Probable cause implies that there is a legitimate reason to believe that contraband or illegal items may be concealed within an inmate's body cavities. When medical personnel are available, it ensures that the search is conducted safely and in a manner that respects the health and rights of the inmate, adhering to legal and procedural standards.

In contrast, routine medical checks are typically non-invasive and do not involve searches of body cavities, which means they wouldn't warrant the same level of authorization. Similarly, while an inmate refusing a standard search might escalate the situation, it by itself does not establish probable cause needed for a body cavity search. Lastly, during a scheduled inmate transfer, search procedures generally focus on ensuring security and transport safety without necessarily involving invasive searches unless there is prior indication that specific contraband may be present.