Inmate & Bail Glossary
Plain-English definitions of the bail, jail, and inmate terms you'll run into.
The world of arrests, jails, and bail comes with its own confusing vocabulary — and it tends to arrive exactly when you are least prepared to learn it. This glossary explains the terms you are most likely to encounter, in plain language, so you can make decisions with confidence. None of this is legal advice; for guidance about a specific case, talk to a qualified attorney or your local court.
Below you will find clear definitions for the words that come up most often when a loved one is arrested, from arraignment and bail bond to indemnitor, commissary, and expungement. Understanding these terms makes it easier to talk to facilities, courts, and bail agents — and to use the services on PrisonAssist.com to find and help someone in custody.
- Arraignment
- A defendant's first formal court appearance after arrest, where the charges are read, the defendant enters a plea, and the judge often sets or reviews bail. It is one of the earliest points at which the question of release is decided.
- Arrest
- The act of taking a person into custody because they are suspected of a crime. An arrest is not a conviction or proof of guilt; everyone is presumed innocent unless and until proven guilty in court.
- Bail
- Money or property pledged to a court to allow an arrested person to be released while their case is pending. Bail is meant to ensure the person returns for all required court dates, and cash bail is refunded at the end of the case if they appear as ordered.
- Bail bond
- A surety arranged through a licensed bail bond agent who posts a defendant's full bail with the court in exchange for a non-refundable premium, usually about 10% of the bail amount. The agent takes on the financial risk if the defendant fails to appear.
- Bail schedule
- A preset list used by many jurisdictions that assigns standard bail amounts to specific offenses, allowing some defendants to post bail before seeing a judge.
- Bench warrant
- An order issued by a judge for a person's arrest, commonly because they failed to appear for a scheduled court date or violated a court order.
- Booking
- The administrative process that follows an arrest, in which the facility records the person's identity, the charges, fingerprints, and photographs, and assigns a booking or inmate identification number.
- Collateral
- Property or assets — such as a car, home equity, or cash — pledged to a bail agent to secure a bond. Collateral is returned once the case concludes and the defendant has met all court obligations.
- Commissary
- A store inside a jail or prison where inmates can buy approved items such as snacks, hygiene products, stationery, and clothing using money deposited into their facility account.
- Contraband
- Any item an inmate is not permitted to possess. Sending contraband — even unintentionally, such as the wrong type of paper or a prohibited item in a package — can cause mail or packages to be rejected.
- Conviction
- A formal court determination that a person is guilty of a crime, either by a plea or a verdict. Unlike an arrest, a conviction is a legal finding of guilt.
- Detainer (hold)
- A request by another agency to keep a person in custody, which can prevent release on bail even after bail is posted for the original charge.
- Expungement
- A court-ordered process that erases or destroys an arrest or conviction record so that, in most respects, it is treated as if it never happened. Eligibility and procedures vary widely by state and offense.
- Indemnitor
- The co-signer of a bail bond, sometimes called the guarantor. The indemnitor takes financial responsibility for ensuring the defendant appears in court and may be liable for the full bail and costs if the defendant does not.
- Inmate ID
- A unique booking or identification number assigned to a person in custody. It is required for mail, care packages, money transfers, and bail, and helps make sure your help reaches the right person.
- Own recognizance (OR/PR release)
- Release without paying bail, granted at a judge's discretion based on the defendant's written promise to appear in court. It is sometimes called release on personal recognizance.
- Premium
- The non-refundable fee paid to a bail bond agent for posting a bond, typically around 10% of the total bail amount. It is the agent's compensation for assuming the financial risk of the bond.
- Pretrial detention
- Being held in custody while a case is pending, usually because bail has not been posted or because a judge has ordered the person held without bail.
- Roster
- A facility's list of people currently or recently in custody, often published online. Rosters update on each facility's own schedule, so very recent arrests may not appear right away.
- Sealing
- A court process that hides a record from public view while keeping it accessible to certain agencies. Unlike expungement, the record continues to exist but is no longer publicly available.
- Surety
- The party — typically a bail bond agent or company — that guarantees payment of bail to the court if the defendant fails to appear.
- Warrant
- A legal document issued by a judge authorizing an action such as an arrest or a search. An arrest warrant directs law enforcement to take a specific person into custody.
- Arresting agency
- The law enforcement body — such as a city police department, county sheriff, or state agency — that made the arrest and is responsible for the initial booking and records.
- Money on the books
- Funds deposited into an inmate's facility account, which they can use for commissary purchases, phone time, and certain other approved expenses while in custody.
Now that you know the language, you can put it into action. See how it works, explore our services, or read the blog for deeper guides on bail, mail, care packages, and lowering the cost of staying in touch.
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