1-10. A CI is a civilian who is interned during armed conflict, occupation, or other military operation for security reasons, for protection, or because he or she committed an offense against the detaining power. (JP 3-63) CIs, unless they have committed acts for which they are considered unlawful combatants, generally qualify for protected status according to the GC, which also establishes procedures that must be observed when depriving such civilians of their liberty. CIs are to be accommodated separately from EPWs and persons deprived of liberty for any other reason.
Don't think for one minute that these guidelines are just for foreign nations. These policies apply 'within US territory'.
Download FM 3-39.40 here.
Normally I take stories from Prison Planet with a grain of salt, but you can read the article here and make your own conclusion.