according to wikipedia,

“A body cavity search is either a visual search or a manual internal inspection of body cavities such as for prohibited material (contraband), such as illegal drugs, money, jewelry, or weapons.”

In Medical Fetishism its quite rare micro niche when women pass special kind of examination when they cavities got inspected by experienced medical prison staff but more often on regular gynaelocogy private or special clinics by US Customs and Border Protection.

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cavity search pictures

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Many believes that body cavity searches are done not so much to stop the flow of contraband but rather to harass and humiliate women or man.
Considering women, vaginal inspection may be useful, but still only visual inspection of the rectum will not reveal objects concealed deeply inside.

So it far more invasive than the standard strip search which you may look at these free sites:

Get More Gyno Pictures, Exatremal Fetish actions , Strip Searches performed by security guards at DR TUSHY updates weekly

here are also some free stuff movies taken in prison

Christine was arrested and taken down to the police station. The guard in charge decided she wanted to teach Christine a lesson about prison. She stripped her down and made her stand there naked. She then bent Christine over and gave her a very deep anal cavity search CLICK HERE for more

another forced anal cavity search

While in prison, Jessica came down with the flu. The prison sent her a Military Doctor to give her a checkup. At first she was reluctant to let the Doctor help, but she knew she needed treatment. Watch as she undergoes a complete physical including rectal and vaginal exam, then has her temperature checked rectally.

jail FETISH HERE