Prisons in the United States are run on two tracks. The federal Bureau of Prisons holds people convicted of federal crimes, while each state operates its own department of corrections for violations of state law, and local jails hold people awaiting trial or serving short sentences. Together these systems incarcerate roughly 1.9 million people, an incarceration rate of about 608 per 100,000 residents that is the highest of any independent democracy. How long someone stays, where they are housed, and what protections apply to them depend on which system has custody and on a web of constitutional rules, sentencing statutes, and credit-earning programs layered on top.
Who Runs Which Prisons
The Tenth Amendment leaves criminal law largely to the states, and most incarcerated people in the country are held under state authority.1Congress.gov. Tenth Amendment Each state writes its own criminal code, sets its own sentencing ranges, and runs its own facilities. State prison populations rose roughly 2.5% in 2023 after pandemic-era declines, and local jails add about 660,000 people to the daily count.
Federal prisons are governed by Title 18 of the U.S. Code, which vests control in the Attorney General and delegates operations to the Bureau of Prisons.2Office of the Law Revision Counsel. 18 USC 4001 – Limitation on Detention; Control of Prisons The BOP held approximately 153,500 inmates in early 2025, with about 138,800 in BOP-operated facilities and the rest in contract or community placements.3Federal Bureau of Prisons. Population Statistics Federal custody is typical for people convicted of interstate drug trafficking, financial fraud, firearms offenses, or immigration crimes. The BOP’s statutory duties include safekeeping, care, rehabilitation, and reentry planning covering employment, education, health, and personal finance.4Office of the Law Revision Counsel. 18 USC 4042 – Duties of the Bureau of Prisons
When conduct violates both state and federal law, prosecutors at each level can bring separate charges. The dual-sovereignty doctrine treats the two governments as independent, so prosecution in one system does not bar prosecution in the other.5Legal Information Institute. U.S. Constitution Annotated – Amdt5.3.3 Dual Sovereignty Doctrine Prosecutors often coordinate to avoid duplicative cases, but the legal authority to pursue both exists simultaneously.
Racial disparities run through both systems. Black Americans are incarcerated at roughly six times the rate of white Americans, and Black men face a prison incarceration rate of about 1,826 per 100,000.
Security Levels and What They Look Like Inside
Everyone entering prison goes through a classification assessment weighing offense severity, sentence length, criminal history, and behavioral risk. The score drives the security level of the facility they are sent to.
Minimum-security facilities, sometimes called prison camps, use dormitory housing with limited perimeter fencing and often allow work details outside the grounds. Medium-security prisons add reinforced perimeters, electronic surveillance, and controlled movement between areas. Maximum-security facilities use individual cells, strict limits on out-of-cell time, and heavy staffing. Administrative-maximum, or supermax, facilities confine people to their cells for 22 or more hours per day.
Classification is reviewed periodically. Good behavior, program completion, and time served can move someone to a lower level, which brings more freedom, better programming, and easier family visitation. That mobility is one of the strongest behavioral incentives the system has.
Restrictive Housing
Restrictive housing, often called solitary confinement, places a person in a locked cell for at least 22 hours a day with minimal human contact. As of late 2023, roughly 12,000 people were in restrictive housing in federal prisons alone, with tens of thousands more in state systems.6Government Accountability Office. Federal Prisons Haven’t Addressed Longstanding Concerns About Overuse of Solitary Confinement The Government Accountability Office has repeatedly flagged the BOP’s failure to address longstanding concerns about overuse.
Internal Discipline
When a person is accused of breaking a facility rule, the Constitution requires minimum procedural fairness before any punishment that affects a liberty interest such as good-time credits. The Supreme Court set those requirements in Wolff v. McDonnell: written notice of the charges at least 24 hours before a hearing, the chance to present evidence and call witnesses when doing so would not threaten safety, and a written statement explaining the decision.7Justia U.S. Supreme Court. Wolff v McDonnell, 418 US 539 (1974) There is no right to a lawyer, and the hearing officer need not be independent in the way a judge would be. Sanctions range from loss of commissary or visitation privileges to placement in restrictive housing.
Rights That Survive Incarceration
Going to prison removes freedom of movement but not the Constitution. Courts have spent decades defining which rights carry through the gate and how far officials can restrict them in the name of security and order.
Cruel and Unusual Punishment
The Eighth Amendment forbids cruel and unusual punishments.8Congress.gov. U.S. Constitution – Eighth Amendment Inside a prison, that means conditions cannot involve unnecessary suffering or deliberate neglect of basic needs. In Estelle v. Gamble, the Supreme Court held that deliberate indifference to a prisoner’s serious medical needs violates the Eighth Amendment, whether the indifference comes from medical staff failing to treat an illness or from guards blocking access to care.9Justia U.S. Supreme Court. Estelle v Gamble, 429 US 97 (1976) Simple negligence or a disagreement over treatment does not meet the standard. A plaintiff must show that staff knew of and disregarded a substantial risk of serious harm.
Due Process
The Fourteenth Amendment bars any state from depriving a person of life, liberty, or property without due process of law.10Constitution Annotated. Amdt14.S1.3 Due Process Generally Behind bars, that means any action taking away a recognized liberty interest, including revoking earned good-time credits, requires fair procedures. Serious consequences cannot be imposed through informal or arbitrary decisions.
Religious Practice
The Religious Land Use and Institutionalized Persons Act, passed in 2000, forbids the government from substantially burdening an incarcerated person’s religious exercise unless the restriction serves a compelling interest and uses the least restrictive means available.11Office of the Law Revision Counsel. 42 U.S. Code 2000cc-1 – Protection of Religious Exercise of Institutionalized Persons That is the strictest standard courts apply. It covers dietary requirements, grooming practices, access to religious texts, and group worship. Before the law passed, courts gave prisons much more deference on these questions.
Disability Accommodations
Title II of the Americans with Disabilities Act applies to state and local correctional facilities.12ADA.gov. Americans with Disabilities Act Title II Regulations People with disabilities must be able to access programs, services, and activities on equal terms. New or altered facilities must be physically accessible, and existing facilities must achieve program accessibility even if that means modifying procedures or providing aids. Compliance in practice varies widely, and disability grievances remain a significant category of prison litigation.
Suing Over Prison Conditions
Anyone who wants to challenge prison conditions in federal court must first exhaust all available internal grievance procedures. The Prison Litigation Reform Act imposes this rule regardless of the kind of relief sought.13Office of the Law Revision Counsel. 42 U.S. Code 1997e – Suits by Prisoners It also bars federal lawsuits seeking damages for purely mental or emotional injury unless the person can show a prior physical injury or a sexual assault. Missing a single step in the grievance process can get a case dismissed before a judge ever reaches the merits.
Private Prisons
About 8% of the combined state and federal prison population is held in facilities run by private corporations. Twenty-seven states and the federal government use private operators under contracts in which the government retains legal custody while the company handles staffing, daily operations, and facility maintenance for a per-person daily rate.
Federal policy on private prisons has swung with administrations. Executive Order 14006, signed in January 2021, directed the Department of Justice to stop renewing contracts with privately operated criminal detention facilities.14Federal Register. Reforming Our Incarceration System To Eliminate the Use of Privately Operated Criminal Detention Facilities The order was revoked in January 2025, reopening the door to new contracts. As of early 2025, the BOP reported zero inmates in privately managed facilities, a figure that may shift as policy shifts.3Federal Bureau of Prisons. Population Statistics Supporters say private facilities ease overcrowding and can be built faster than government ones. Critics point to lower staffing, higher turnover, and incentives that reward keeping beds full rather than reducing recidivism.
Sentencing and Mandatory Minimums
Federal sentencing for many drug and firearms offenses runs through mandatory minimum statutes that take away judicial discretion below a set threshold. In fiscal year 2024, more than 57% of people sentenced for federal drug offenses faced a charge carrying a mandatory minimum. For crack cocaine cases, over 75% remained subject to the minimum at sentencing. Firearms cases under 18 U.S.C. § 924(c), which penalizes using a gun during a violent crime or drug trafficking offense, carried mandatory minimums in about 81% of cases.15United States Sentencing Commission. Mandatory Minimum Penalties
Two main escape valves exist. The safety valve allows judges to go below the minimum for low-level, nonviolent drug defendants with limited criminal histories, and about 16% of those facing drug mandatory minimums received that relief in fiscal year 2024. Another 15% cooperated with the government and received a reduced sentence through substantial-assistance departures.15United States Sentencing Commission. Mandatory Minimum Penalties The First Step Act of 2018 expanded the safety valve and cut some of the harshest repeat-offender minimums, lowering a 20-year minimum to 15 years and a life-imprisonment minimum to 25 years for certain drug traffickers with prior convictions.16Federal Bureau of Prisons. An Overview of the First Step Act
Earning Time Off and Getting Out Early
The most common way federal inmates shorten their time is good conduct time. Under the First Step Act’s revision of 18 U.S.C. § 3624(b), a person can earn up to 54 days of credit for each year of the sentence imposed rather than each year served. A 10-year sentence with maximum credit yields 540 days off.16Federal Bureau of Prisons. An Overview of the First Step Act
The First Step Act also created earned time credits for completing recidivism reduction programs and productive activities. The BOP uses a risk assessment tool called PATTERN to match people with appropriate programming, and the credits can be applied toward earlier transfer to a halfway house or home confinement.17United States Sentencing Commission. First Step Act Earned Time Credits People convicted of violent offenses, terrorism, sex crimes, or high-level drug trafficking are generally ineligible to earn these credits, though they can still participate in programs for other benefits.
Compassionate Release
A federal court can reduce a sentence when extraordinary and compelling reasons justify it. Under 18 U.S.C. § 3582(c)(1)(A), an incarcerated person can file a motion directly with the court after exhausting BOP administrative remedies or waiting 30 days from when the warden received the request, whichever is first.18Office of the Law Revision Counsel. 18 USC 3582 – Imposition of a Sentence of Imprisonment Qualifying reasons include terminal illness, serious medical conditions that prevent self-care, deteriorating health due to aging, and unusually long sentences. Rehabilitation alone does not qualify, though it can strengthen a motion combined with other factors. Courts granted roughly 16% of compassionate release motions in fiscal year 2024.
A separate provision covers elderly inmates. Anyone at least 70 years old who has served at least 30 years of a sentence and is not deemed dangerous may be eligible for release.18Office of the Law Revision Counsel. 18 USC 3582 – Imposition of a Sentence of Imprisonment State systems have their own medical and compassionate release programs, with eligibility rules and approval rates that vary widely.
Prison Labor
The Thirteenth Amendment abolished slavery and involuntary servitude but kept an explicit exception “as a punishment for crime whereof the party shall have been duly convicted.”19Congress.gov. U.S. Constitution – Thirteenth Amendment That clause provides the constitutional basis for requiring incarcerated people to work. Most state systems assign inmates to facility maintenance, kitchen duty, laundry, or groundskeeping, and wages range from nothing in some states to about $2.00 per hour for specialized assignments. In the federal system, Federal Prison Industries, known by its trade name UNICOR, employs inmates in manufacturing and service jobs at pay ranging from $0.23 to $1.15 per hour, with deductions for restitution and other obligations further reducing take-home pay.20Federal Bureau of Prisons. UNICOR Participation in work programs can improve classification and contribute toward program-based sentence credits.
What Happens After Release
Leaving prison rarely ends the case. The federal system replaced traditional parole with supervised release in 1984. Supervised release is tacked on at the end of the prison term rather than substituting for part of it. Federal judges can impose up to five years of supervised release for serious felonies and up to three years for mid-level felonies.21Office of the Law Revision Counsel. 18 USC 3583 – Inclusion of a Term of Supervised Release After Imprisonment
Standard conditions prohibit new crimes, possession of controlled substances, and failed drug tests. Courts can add discretionary conditions tailored to the person, as long as those conditions are reasonably related to the offense and no more restrictive than necessary.21Office of the Law Revision Counsel. 18 USC 3583 – Inclusion of a Term of Supervised Release After Imprisonment People convicted of sex offenses face registration requirements and potentially warrantless searches. Violating a condition can lead to revocation and a return to prison.
Most state systems still use traditional parole, where a parole board decides whether to release someone before the end of the sentence. Eligibility differs by state: some allow consideration after a court-imposed minimum term, others require at least 85% of the sentence to be served. The BOP is required by statute to develop reentry plans that help people apply for benefits, obtain identification such as a Social Security card and driver’s license, and line up resources for employment, health, and personal finance before release.4Office of the Law Revision Counsel. 18 USC 4042 – Duties of the Bureau of Prisons
What It Costs
The federal government spent an average of $44,090 per inmate in fiscal year 2023, roughly $121 per day.22Federal Register. Annual Determination of Average Cost of Incarceration Fee (COIF) State costs vary enormously, with median state spending at about $61,000 per prisoner per year and a range stretching from under $20,000 in Mississippi to nearly $285,000 in Massachusetts.23USAFacts. How Much Do States Spend on Housing Prisoners? Staffing is the largest single expense, and healthcare is the fastest-growing category, driven by an aging prison population that requires chronic disease management, mental health treatment, and sometimes end-of-life care. Facilities must provide that care to meet Eighth Amendment standards regardless of cost.