What are four types of prisons for adults?

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There are many different types of prison. Prisoners will be sent to a specific facility depending on the type of crime (petty to violent), and the level of law that has been broken (state, federal, military).

Here's a quick run down on the major prison categories:

Juvenile: Reserved for young (under 18 years of age) prisoners.

Minimum Security: Reserved for committers of non-violent crimes. Prisoners are often incarcerated for "white-collar" crimes, such as fraud. Security is minimal and accommodation is often dormitory style.

Medium Security: The next step up, medium security prisons are what most people think of as "prison". Personal freedoms are fewer than in a minimum security facility and the daily routine of inmates is more regimented. "Cage" style accommodation is often used.

Close Security: Here prisoners are usually housed 1-2 per cell. Each cell has toilet facilities. Inmates may leave their cells for work programs, or to use common areas.

Maximum Security: Maximum security is reserved for offenders of the most violent crimes. Guards are armed and plentiful. Every inmate is regarded as dangerous. The USA also has a Supermax prison facility. 

Psychiatric: Psychiatric prisons often resemble hospitals. They house inmates who are deemed "mentally unfit."

Military: Military prisons house prisoners of war and personnel who have broken national security laws. Every branch of the military has their own prison facilities.

Federal or State? If someone commits a Federal crime, then they are likely to be sent to a Federal prison -- the exception being violent crime. Federal prisons also prohibit parole.

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