Federal Criminal Law Glossary — Plain Language

Acceptance of Responsibility: A formal recognition by the defendant that they are guilty of the offense, typically demonstrated by pleading guilty and cooperating with the presentence investigation. The sentencing guidelines reward this with a two- or three-level reduction in the offense level — which can translate to a significantly shorter sentence.
Arraignment: An early court hearing at which the defendant is formally advised of the charges and asked to enter a plea (typically "not guilty" at this stage, even if a plea deal will come later). It is usually one of the first appearances in federal court.

Base Offense Level: The starting number in the federal sentencing guidelines calculation, assigned by the type of crime. Adjustments are then added or subtracted based on the specifics of the offense (quantity, role, use of a weapon, etc.) to reach the total offense level.
Books (Commissary Account): Informal term for the inmate's trust fund or commissary account — the money held by the facility that they use to purchase soap, food, stamps, phone time, and other items beyond what the institution provides. Families can typically add money to the books through the facility's designated payment service.
BOP (Bureau of Prisons): The federal agency — part of the Department of Justice — that operates the federal prison system. Once sentenced, federal inmates are assigned to a BOP facility. BOP manages everything from facility placement (designation) to programming, mail, visitation rules, and release. The BOP inmate locator and facility information are at bop.gov.

Corrlinks / TRULINCS: The email system used in BOP federal prisons. TRULINCS is the broader inmate computer system; Corrlinks is the email platform accessible to family and friends outside. The inmate initiates the connection from their end; once linked, both sides can exchange messages. All messages are subject to review.
Cooperation Agreement: An arrangement in which the defendant agrees to assist the government — typically by providing information, testifying, or both — in exchange for the possibility of a reduced sentence. Cooperation is not guaranteed to result in a reward; the government must later file a motion stating that the assistance was "substantial." See also: 5K1.1 Motion, Rule 35.
Criminal History Category: One of two inputs in the sentencing guidelines calculation (the other is the offense level). A defendant's prior criminal record is scored based on past convictions, sentences served, and whether they were under a sentence at the time of the offense. The score places them in one of six categories (I through VI), with Category I reflecting minimal history.

Departure (Downward / Upward): A formal adjustment within the sentencing guidelines framework that moves the guidelines range higher or lower based on specific, recognized factors. A downward departure reduces the range; an upward departure increases it. Departures differ from variances: departures are based on specific guidelines provisions, while variances are based on the broader 18 U.S.C. § 3553(a) sentencing factors.
Detention Hearing: An early hearing — usually within a few days of arrest — at which a judge decides whether the defendant will be released or held in custody while the case proceeds. In federal cases, the standard is whether there is any condition or combination of conditions that would reasonably assure the person's appearance and the safety of the community. The outcome of this hearing matters enormously; many defendants remain in custody from arrest through sentencing.
Docket: The official chronological record of all filings and events in a federal court case — every motion, order, appearance, and hearing is listed. Dockets are publicly accessible through PACER (pacer.uscourts.gov). Families can use the docket to track case progress, see what has been filed, and find the name of the assigned attorney.

5K1.1 Motion (Substantial Assistance): A motion filed by the government before sentencing — named after U.S.S.G. § 5K1.1 — telling the judge that the defendant provided substantial assistance in the investigation or prosecution of others. A 5K1.1 motion allows the judge to sentence below the guidelines range, and sometimes below a mandatory minimum. The government — not the defendant — controls whether this motion is filed.
Federal Facility Types (FCI, FPC, FDC, MDC): FCI (Federal Correctional Institution) — a standard BOP prison. FPC (Federal Prison Camp) — minimum-security facility, often called a "camp." FDC (Federal Detention Center) and MDC (Metropolitan Detention Center) — facilities that hold people in pretrial custody or during the early stages of a federal case, typically in urban areas near courthouses.
Factual Basis (Statement of Facts): The written account of the offense that a defendant agrees to as part of a guilty plea. Every admission in the factual basis can affect the sentencing guidelines calculation — drug quantities, dollar amounts, role in the offense — so this document deserves careful scrutiny before any plea is signed.

Grand Jury: A group of citizens convened in secret to review evidence presented by a federal prosecutor and decide whether there is probable cause to bring criminal charges. Grand jury proceedings are not trials and are not adversarial — the defense is not present. The grand jury's decision to charge results in an indictment. Federal law requires a grand jury indictment for felony charges.
Guidelines (Federal Sentencing Guidelines): The U.S. Sentencing Guidelines (USSG) are a detailed framework used to calculate a recommended sentence range in federal cases. They take into account the type of offense, its specific characteristics, and the defendant's criminal history. Since the Supreme Court's 2005 Booker decision, the guidelines are advisory — judges must consider them but are not bound by them.

Indictment vs. Information: Both are formal charging documents, but they arise differently. An indictment is voted on by a grand jury; it's required for felony charges when the defendant does not waive that right. An information is filed directly by the prosecutor, without a grand jury vote — defendants often consent to being charged by information when they have a plea agreement in place. Both documents set out the charges and the factual basis for the prosecution.
Ineffective Assistance of Counsel (IAC): A constitutional claim that an attorney's performance was so deficient that it denied the defendant their Sixth Amendment right to counsel. To succeed on this claim (under the Strickland standard), a defendant must show both (1) that the lawyer's performance was objectively unreasonable, and (2) that the deficiency actually affected the outcome. This is commonly raised in § 2255 motions after conviction.
Initial Appearance: The first formal court appearance after arrest, usually within 24–48 hours. At the initial appearance, the judge advises the defendant of the charges and their rights, and sets conditions of release or detention pending the full detention hearing. Counsel — appointed or retained — is typically present or arranged at this stage.

Mandatory Minimum: A sentence floor set by statute — a length of time the judge must impose regardless of the guidelines range, mitigating circumstances, or the defendant's history. Mandatory minimums are most common in drug trafficking and certain firearms offenses. The only ways around them are limited: qualifying for the safety valve, providing substantial assistance (5K1.1), or certain First Step Act provisions.

Offense Level (Total Offense Level): A number — from 1 to 43 — produced by the sentencing guidelines calculation that represents the severity of the offense as the guidelines measure it. It starts at the base offense level and is adjusted up or down based on specific characteristics of the offense (quantity, role, use of a weapon, obstruction, acceptance of responsibility, etc.). The total offense level and the criminal history category together determine the guidelines range.

PACER (Public Access to Court Electronic Records): The federal judiciary's online system for accessing court documents and dockets. Anyone can register for a free account and search for cases, view filings, and track hearings. Registration is free; searches cost a few cents per page, but fees are waived for accounts that stay under a small quarterly threshold. Access at pacer.uscourts.gov.
Plea Agreement: A contract between the defendant and the government in which the defendant agrees to plead guilty (to some or all charges), and the government agrees to certain terms — which may include dropping charges, recommending a specific sentence, or agreeing not to prosecute related conduct. More than 97% of federal convictions come from guilty pleas. See the article on understanding the plea deal for a full breakdown.
PSR (Presentence Report / Presentence Investigation Report): A detailed document prepared by a U.S. Probation Officer after a conviction or plea, submitted to the judge before sentencing. The PSR includes the guidelines calculation, a narrative of the offense, the defendant's personal and criminal history, victim impact statements, and a sentencing recommendation. It is often the single most influential document in the case — errors should be identified and challenged in writing before sentencing.
Proffer (Proffer Session): A meeting between the defendant (and their attorney) and prosecutors or investigators, in which the defendant provides information about their knowledge of criminal activity. Proffers are typically governed by a proffer agreement that limits how the statements can be used against the defendant if no cooperation agreement is ultimately reached. Required in many cooperation situations and for safety valve eligibility.

RDAP (Residential Drug Abuse Program): A 9-to-12-month intensive drug treatment program offered at certain BOP facilities. Inmates who complete RDAP may be eligible for a sentence reduction of up to 12 months, as well as early transfer to a halfway house or home confinement. Eligibility requires a documented substance abuse disorder and that the conviction not involve certain disqualifying offenses.
Restitution: A court order requiring the defendant to compensate victims for financial losses caused by the crime. Unlike a fine (which goes to the government), restitution goes to identified victims. In many federal cases — particularly fraud, theft, and drug distribution cases — restitution is mandatory. It survives bankruptcy, continues through supervised release, and can follow someone for decades.
Rule 35 Motion: A government motion to reduce a sentence based on substantial assistance provided after sentencing — named after Federal Rule of Criminal Procedure 35. Similar in effect to a 5K1.1 motion but available post-sentencing. The government controls whether to file it; the court controls the extent of the reduction.

Safety Valve: A provision in federal law (18 U.S.C. § 3553(f)) that allows a judge to sentence certain non-violent drug offenders below an otherwise applicable mandatory minimum. To qualify, the defendant generally must have minimal criminal history, not have been a leader or organizer in the offense, not have used violence or a firearm, and must have provided a complete and truthful proffer to the government. It doesn't apply to all drug offenses or all defendants.
§ 2255 Motion: A post-conviction motion filed in the sentencing court asking it to vacate, set aside, or correct the sentence. It is not an appeal — it's a separate civil action. Common grounds include ineffective assistance of counsel, constitutional violations not raised on direct appeal, and retroactive changes in the law. There is generally a one-year statute of limitations from when the conviction became final. See the article on what a 2255 motion is for the full explanation.
Sentencing Memorandum: A document filed by the defense (and sometimes the prosecution) before the sentencing hearing, arguing to the judge what sentence is appropriate. A well-written defense sentencing memo presents the defendant as a full human being — their history, their family, their contributions, the context of the offense, and the reasons a below-guidelines sentence is sufficient. It is one of the most important pieces of advocacy in the entire case.
Supervised Release: The federal equivalent of parole — a period after release from prison during which the person is supervised by a U.S. Probation Officer and must comply with court-ordered conditions. These typically include regular check-ins, restrictions on travel or association, drug testing, and employment requirements. Violations can result in revocation and additional imprisonment. Federal law abolished traditional parole in 1987 for most offenses; supervised release replaced it.

Trial Penalty: The documented disparity between sentences received by defendants who plead guilty versus those who exercise their right to trial and are convicted. Studies consistently show that defendants who lose at trial receive significantly longer sentences than those who pleaded to comparable conduct. The trial penalty is a product of how the guidelines are structured (loss of acceptance points, different charge exposures) and judicial discretion. It is a real factor in the plea-vs-trial calculation.

U.S. Attorney / AUSA: The U.S. Attorney is the chief federal prosecutor for a particular judicial district, appointed by the President. AUSAs (Assistant U.S. Attorneys) are the line prosecutors who actually handle cases day to day. When families talk about "the prosecutor" or "the government," they typically mean the AUSA assigned to the case.

Variance (Downward Variance): A sentence below the guidelines range based on the judge's consideration of the broader factors in 18 U.S.C. § 3553(a) — not a specific guidelines provision, but the judge's overall assessment of what sentence is "sufficient but not greater than necessary." Downward variances require advocacy: a strong sentencing memorandum, character letters, expert testimony, and a full picture of the person being sentenced.

The Federal System, Translated.

The books put this vocabulary to work.