Items can be concealed in a number of body cavities. For example, objects may be concealed by inserting them into the rectum. Illegal drugs can be placed in condoms and temporarily stored in the colon. Cylinders such as cigar tubes are used to hide money, intravenous syringes, and knives. Duplicate handcuff keys can be concealed in many body orifices. These goods are considered valuable inside a prison and can pose a security risk to staff and inmates at such facilities.
During manual body cavity searches, body orifices are probed using fingers or the entire hand. The circumstance in which these inspections may be done is often restricted. For example, they are done on individuals refusing to offer to consent to a visual body cavity search or in situations where there is strong evidence to suspect the presence of contraband.
The cavity search has proven ineffective in the prevention of smuggling objects as it cannot detect objects in the intestines or stomach. It has become normal for authorities to isolate individuals in a monitored environment until they pass excreta and/or to x-ray the individual as it is less invasive and psychologically damaging.
Some inmates and human rights activists argue that body cavity searches are done not so much to stop the flow of contraband but rather to harass and humiliate detainees. A visual inspection of the rectum will not reveal objects concealed deeply inside. Likewise, it is possible to circumvent detection during manual body cavity searches. In some instances, suspects swallow packages of drugs protected by condoms and allow them to pass through their digestive tract. Only diagnostic imaging will reveal the concealed contraband.
X-ray diagnostic images can reveal concealed contraband that could not otherwise be detected. The yellow marks show capsules of illegal drugs swallowed by the suspect. Such smugglers are often called drug packers or mules.
Because these searches are highly invasive and greatly compromise an individual’s right of privacy, the legality of visual and manual body cavity searches is frequently contested.
In the United States, Bell v. Wolfish is the benchmark case on this issue. In its judgment of the case, the U.S. Supreme Court established a standard of reasonable grounds for performing cavity searches. Among these are security concerns at prisons.
In the UK, cavity searches are not carried out upon entry to prisons, although new prisoners are required to perform squats as part of their strip-search, and may be visually searched, but prison staff do not have any powers to carry out cavity searches.
Law enforcement officers are not allowed to conduct cavity searches or strip searches in Pakistan. Any officer who conducts a cavity search or strip search can be sentenced up to 4 years in prison and given a Rs.7500 fine.
The body cavity search is frequently used as a joke in comedies such as the movie Beavis and Butt-head Do America and Seinfeld. This is due to its humiliating, uncomfortable, and invasive nature. Generally, it adds to the suffering of a comedic foil. It is generally not depicted explicitly, but implied by the donning of a lubricated glove by a searcher. It is similar to the use of the rectal examination in this regard.