What are four types of prisons for adults?

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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