The correctional system is how government holds people before trial and carries out criminal sentences after conviction. It runs on three main levels: local jails for arrests and short sentences, state prisons for felonies prosecuted by the states, and federal prisons for federal crimes. Military confinement facilities and juvenile detention centers sit alongside those. Understanding how the correctional system works means following a person through its stages: arrest and intake, classification into a security level, confinement under a set of constitutional rules, programs that can shorten the sentence, and finally release under community supervision.
Which Facility Holds Whom
Where someone ends up depends on who is prosecuting and how long the sentence is. Cities and counties run jails, which hold people just arrested, people awaiting their first court appearance, and people serving shorter sentences. States run prisons through their departments of corrections for people convicted of state felonies carrying multi-year sentences. Each state writes its own rules and operates its own facilities.
The federal system is separate. Under 18 U.S.C. § 4001, the Attorney General controls and manages all federal penal and correctional institutions.1Office of the Law Revision Counsel. 18 USC 4001 – Limitation on Detention; Control of Prisons The Bureau of Prisons (BOP) handles the day-to-day work and decides where each person is housed.
Service members convicted under the Uniform Code of Military Justice go to military correctional facilities. The Secretary of each armed service may establish whatever facilities are needed, and the commanding officer of each facility has custody and control of those confined, with an emphasis on rehabilitation and possible return to duty.2Office of the Law Revision Counsel. 10 USC 951 – Establishment; Organization; Administration Juveniles go to detention centers built around age-appropriate programming rather than pure confinement.
Intake and Classification
Someone entering federal custody is not simply assigned to the nearest open bed. The BOP uses a point-based classification system that scores each person across the severity of the current offense, criminal history, sentence length, history of violence, escape history, age, education, and substance abuse background.3Federal Bureau of Prisons. Form BP-A0338 – Custody Classification Younger people score higher because statistical models show elevated risk. Those with a verified high school degree score lower than those without.
The score maps to a security level, but certain factors act as overrides that force a higher placement regardless of the point total, including sex offenses, serious violence, and escape history. Under 18 U.S.C. § 3621, the BOP also weighs the nature and circumstances of the offense, the person’s background, any sentencing court recommendations, and relevant Sentencing Commission policy.4Office of the Law Revision Counsel. 18 USC 3621 – Imprisonment of a Convicted Person The same statute requires the BOP to place people as close as practicable to their primary residence, and to the extent possible within 500 driving miles.
Security Levels and Daily Life
The classification score channels people into one of several security environments. Each has a very different physical layout and daily routine.
- Minimum security camps have the fewest physical barriers, typically no high fences or armed perimeter patrols, and relatively free movement. They are designated for people with low flight risk and nonviolent histories.
- Low security institutions use double-fenced perimeters and more structured movement, but allow dormitory-style housing and a range of work and program assignments.
- Medium security facilities add reinforced fencing, electronic detection systems, and tighter movement controls. Housing is typically cell-based.
- High security U.S. Penitentiaries feature high walls, armed guard towers, frequent headcounts, and staff-escorted movement through secure checkpoints.
- Administrative maximum facilities are reserved for people who pose extreme risks. Individuals spend the vast majority of their time in single-cell isolation with minimal contact with others.
State systems use similar tiered approaches with different labels and criteria. The common thread: security level dictates where someone sleeps, how much they can move, and what programs they can access.
Rights and Legal Protections Inside
People in custody do not forfeit their constitutional rights at the jailhouse door. The legal framework comes from two amendments and a handful of federal statutes, and this is where the system faces the most litigation.
The Eighth Amendment Floor
The Eighth Amendment states: “Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted.”5Library of Congress. U.S. Constitution – Eighth Amendment Courts read this as imposing affirmative duties on prison officials: provide humane conditions, ensure adequate food, clothing, shelter, and medical care, and take reasonable steps to protect people from violence.6Ninth Circuit District & Bankruptcy Courts. 9.31 Particular Rights – Eighth Amendment – Convicted Prisoners Claim re Conditions of Confinement/Medical Care
The standard for proving a violation is deliberate indifference. A prison official is liable only if the official knows of and disregards an excessive risk to an incarcerated person’s health or safety. The official must be aware of facts suggesting a substantial risk of serious harm and actually draw that inference. Negligence is not enough.
Due Process and Fair Treatment
The Supreme Court has held that there is “no iron curtain drawn between the Constitution and the prisons of this country,” and that incarcerated individuals have a right to fair and regular treatment during confinement.7Constitution Annotated. Amdt14.S1.5.6.4 Prisoners and Procedural Due Process In practice, disciplinary actions affecting significant liberty interests, like placement in solitary or loss of good conduct time, must follow procedural safeguards including notice and an opportunity to respond.
Suing Over Conditions
When a state or local official violates a person’s constitutional rights, the person can sue in federal court under 42 U.S.C. § 1983. The statute makes anyone who deprives someone of constitutional rights “under color of” state law liable for damages.8Office of the Law Revision Counsel. 42 USC 1983 – Civil Action for Deprivation of Rights Section 1983 does not itself create rights; it provides a mechanism to enforce rights that already exist under the Constitution or federal law.
The Civil Rights of Institutionalized Persons Act (CRIPA) is separate. It authorizes the Attorney General to investigate and sue state or local governments that engage in a pattern of depriving institutionalized persons of their constitutional rights.9Department of Justice. Civil Rights of Institutionalized Persons CRIPA covers prisons, jails, juvenile facilities, and other publicly operated institutions. These actions are brought by the federal government to address systemic problems rather than by individuals.
Before filing any federal lawsuit about prison conditions, however, a person must first exhaust every available administrative remedy. The Prison Litigation Reform Act requires filing a grievance through the facility’s internal complaint process and appealing through each level before a court will hear the case.10Office of the Law Revision Counsel. 42 USC 1997e – Suits by Prisoners Courts dismiss cases where the person skipped or incompletely followed the grievance procedure, even when the underlying claim has merit. Because internal grievance systems impose strict filing deadlines, missing those deadlines can permanently bar a lawsuit.
Programs and Earning Time Off a Sentence
Most facilities offer programming aimed at reducing the odds that someone returns. GED preparation is the most widely available program in both state and federal facilities. Vocational programs teach trades like welding, carpentry, and food service. Internal work assignments cover laundry, grounds, and kitchen duties. Most facilities also maintain law libraries for research related to a person’s case.
Two separate federal mechanisms can shorten a federal sentence.
Good Conduct Time
Federal prisoners serving sentences longer than one year, other than life sentences, can earn up to 54 days of credit toward their sentence for each year served, provided the BOP determines they have shown exemplary compliance with institutional rules.11Office of the Law Revision Counsel. 18 USC 3624 – Release of a Prisoner The BOP also considers whether the person has earned or is making progress toward a GED. If conduct falls short, the credit is reduced or denied, and credit not yet earned cannot be retroactively granted.
First Step Act Credits
The First Step Act of 2018 added a second system on top. A person who successfully participates in evidence-based programs or productive activities earns 10 days of time credit for every 30 days of participation. Those assessed as minimum or low recidivism risk who maintain that level across two consecutive assessments earn an additional 5 days per 30-day period, for a total of 15 days.12Office of the Law Revision Counsel. 18 USC 3632 – Development of Risk and Needs Assessment System These credits can be applied toward transfer to prerelease custody: home confinement or a residential reentry center.
Not everyone qualifies. People convicted of certain serious offenses listed in the statute are ineligible to earn these credits. Those subject to a final order of removal under immigration law can earn the credits but cannot apply them toward early release. The BOP calculates and applies good conduct time before layering on any First Step Act credits.
Getting Out: Reentry Centers and Pre-Release
Federal law builds in a transitional step before full release. Residential reentry centers, sometimes called halfway houses, are community-based facilities where people serve the final months of their sentence in a structured but less restrictive setting. Federal law allows the BOP to place someone in prerelease custody for up to 12 months before their release date.11Office of the Law Revision Counsel. 18 USC 3624 – Release of a Prisoner Alternatively, the BOP can transfer someone to home confinement for the shorter of 10 percent of their sentence or six months.
People at reentry centers remain in federal custody. They are subject to regular counts, sign-out procedures for approved activities, and random drug testing. Residents are expected to find employment, typically within 15 days of arrival, and pay a subsistence fee of 25 percent of their gross income to offset costs.13Federal Bureau of Prisons. Residential Reentry Management Centers Services include employment counseling, job placement, financial management, substance abuse treatment, and access to medical and mental health care.
The First Step Act also requires the BOP to help people apply for federal and state benefits and obtain identification, including a Social Security card, driver’s license or official photo ID, and birth certificate before release.14Federal Bureau of Prisons. An Overview of the First Step Act Without those documents, opening a bank account, renting an apartment, and starting a job become nearly impossible.
Supervision After Release
The system follows most people past the prison gate. Which form of supervision applies depends on how the sentence was structured.
Probation
Probation is a sentence served instead of prison. Under 18 U.S.C. § 3561, a court can impose probation for most offenses, with two exceptions: it is unavailable for the most serious federal felonies (Class A and Class B), and it cannot run alongside a prison sentence for the same offense.15Office of the Law Revision Counsel. 18 USC 3561 – Sentence of Probation Federal probation runs one to five years for felonies and up to five years for misdemeanors. A person on probation reports to a probation officer and follows the conditions the court sets. Violating the terms can lead the court to revoke probation and impose incarceration.
Supervised Release
Supervised release is not early release. It is a period of monitoring that begins after a person has fully served their prison sentence. For the most serious federal felonies, supervised release can last up to five years; for lower-level felonies, up to three years; and for misdemeanors, up to one year.16Office of the Law Revision Counsel. 18 USC 3583 – Inclusion of a Term of Supervised Release After Imprisonment
Everyone on supervised release must comply with mandatory conditions: no new crimes, no controlled substances, drug testing within 15 days of release and periodically afterward, DNA collection, and restitution as ordered. Courts can add conditions like mental health treatment, employment requirements, or location restrictions, as long as those conditions are reasonably related to the offense and no more restrictive than necessary.
Federal parole, by contrast, was largely abolished by the Sentencing Reform Act of 1984 for offenses committed after November 1, 1987. Supervised release replaced it as the primary mechanism for post-incarceration monitoring in the federal system. Some state systems still operate traditional parole boards.
Revocation
Violating supervised release can send someone back to prison. The process starts with a preliminary hearing before a magistrate judge to determine whether there is probable cause that a violation occurred. The person has the right to notice of the allegations, the right to counsel, and the opportunity to present evidence and question witnesses.17Legal Information Institute. Federal Rules of Criminal Procedure Rule 32.1 – Revoking or Modifying Probation or Supervised Release If probable cause is found, a full revocation hearing follows. Certain violations trigger mandatory revocation: possessing a controlled substance, possessing a firearm, or refusing to take a drug test.
What It Costs the Person in Custody
Incarceration carries real financial costs that fall on both the government and the person inside. Phone and video calls have historically been a major expense for incarcerated people and their families. Under rate caps the FCC has imposed through the Martha Wright-Reed Act, audio calls in federal prisons are capped at $0.09 per minute as of December 2025, and video calls at $0.23 per minute. Jails have tiered caps based on population size, with audio rates ranging from $0.08 per minute at the largest facilities to $0.17 per minute at the smallest, and video rates ranging from $0.17 to $0.42 per minute.18Federal Register. Incarcerated Peoples Communication Services Implementation of the Martha Wright-Reed Act Rates Providers may charge up to an additional $0.02 per minute above these caps to cover facility costs.
Federal prisoners can also purchase food, hygiene products, clothing, and communication supplies through a commissary, subject to a monthly spending limit of roughly $360 on regular items. Stamps, phone credits, and certain over-the-counter medications typically do not count against the cap. Money comes from outside deposits by family, earnings from institutional work assignments, or funds the person brought in at intake.
The costs do not stop at release. People on supervised release or at residential reentry centers pay subsistence fees. Court-ordered restitution and fines follow a person after release. Electronic monitoring, where imposed as a condition of community supervision, may carry daily fees in many jurisdictions, though amounts vary and some states prohibit charging for monitoring altogether.
A Note on Collateral Consequences
Even after the sentence is fully served, a criminal conviction creates a shadow set of legal restrictions that can last for years or indefinitely. These collateral consequences include barriers to employment and occupational licensing, restrictions on housing eligibility, loss of voting rights in some jurisdictions, firearm prohibitions, and registration requirements for certain offenses. Many apply regardless of how much time has passed since the conviction or what rehabilitation the person has completed. A fraud conviction may bar someone from any position of public trust; a felony conviction of any kind may trigger revocation of an unrelated business license. These restrictions sit outside the formal correctional system but are part of the long shadow it casts.