Supervised release is the successor to parole in the federal criminal justice system. In 1984, Congress eliminated parole to create a more determinate federal sentencing structure. In its place, Congress instituted a system of supervised release, which applies to all federal crimes committed after November 1, 1987. Both parole and supervised release call for a period of supervision following release from prison and for reincarceration upon a failure to observe designated conditions. Parole ordinarily stands in lieu of a portion of the original term of imprisonment, while supervised release begins only after full service of the original term (less any "good time" credits). Sentencing courts determine the terms and conditions of supervised release at the same time that they determine other components of a defendant's sentence, and "[t]he duration, as well as the conditions of supervised release are components of a sentence." Sentencing courts are said to have broad discretion when imposing the conditions for supervised release, although such discretion must be understood within the confines established for mandatory conditions, the scope of permissible standard discretionary conditions and special conditions, and the deference that must be afforded the Sentencing Guidelines. Except in specified drug and domestic violence cases, courts may technically exercise discretion to decline to impose supervised release altogether for a particular defendant. However, the Sentencing Guidelines, promulgated by the United States Sentencing Commission, recommend that sentencing courts impose a term of supervised release in most felony cases. A term of supervised release begins when a prisoner is actually released, regardless of when he should have been released. There is a split among the circuits, however, over when the term of supervised release begins for a defendant whose release from federal custody is stayed pending a civil commitment determination. A court may sentence a defendant to several terms of supervised release for each of several crimes, but the terms are served at the same time rather than consecutively. This rule applies even where criminal statutes require a defendant to serve the multiple terms of imprisonment consecutively. Section 3583(b) sets the authorized duration for a term of supervised release, subject to exceptions for certain drug, terrorism, and sex offenses. It authorizes a term of supervised release of not more than five years, when the defendant is convicted of a Class A or B felony (e.g., bank fraud); not more than three years, when the defendant is convicted of a Class C or D felony (e.g., bank robbery); and not more than one year, when the defendant is convicted of a Class E felony or a misdemeanor (crimes with a maximum penalty of imprisonment of three years or less). The exceptions for various drug, terrorism, and sex offenses permit supervised release terms for any number of years up to life and often come with mandatory minimums. While possession with intent to distribute illicit drugs ordinarily permits a sentence of supervised release for any term of years up to life, the accompanying mandatory minimum terms will vary according to the dangerousness of the drug, the volume involved, and whether the defendant is a recidivist. Similar mandatory minimum terms of supervised release apply in the case of kidnaping a child and certain sex offenses. In those instances, the mandatory minimum is five years, regardless of the triggering offense or the defendant's criminal record. For federal "crimes of terrorism," that is, those listed in 18 U.S.C. 2332b(g)(5)(B), the courts must impose a term of supervised release of any term of years or life. The obligation applies regardless of whether the offense was committed for terrorist purposes. In any event, the court may terminate a defendant's term of supervised release at any time after the defendant has served a year on supervised release, based on the defendant's conduct, the interests of justice, and consideration of several of the general sentencing factors. The circuits are divided over whether the court may dismiss such a petition out of hand or must explain its action. Conversely, a court may extend a defendant's term of supervised release, unless the term has already run or unless the court initially imposed the maximum permissible term. Conditions for supervised release are determined during a federal defendant's initial sentencing, based on the nature of the offense, the defendant's particular history, and other factors. When determining applicable conditions, courts consider both federal statutory requirements and federal Sentencing Guidelines. There are two kinds of conditions for supervised release: mandatory and discretionary. Section 3583 insists upon imposition of several mandatory conditions that apply to all defendants, and a few additional conditions that apply only in cases involving domestic violence or sex offenses. All supervised release orders require defendants to (1) refrain from criminal activity; (2) forgo the unlawful possession of controlled substances; (3) cooperate with collection of DNA samples; and (4) submit to periodic drug tests. In addition, prior to release, all prisoners must agree to adhere to the payment schedule for any unpaid fine imposed; however, the statute does not specify that such agreements will be enforced as conditions of supervised release after the agreement is made. To fill this gap, the Sentencing Guidelines identify the payment of fines and restitution as a mandatory condition of supervised release. Additional mandatory conditions apply to domestic violence and sex offenses. Specifically, first-time domestic violence offenders must attend an approved rehabilitation program if one is located within 50 miles of their residence, and convicted sex offenders must register with relevant authorities if the federal sex offender registry requirements apply. Courts have relatively broad discretion to impose supervised release conditions that supplement the mandatory conditions for a particular defendant. Section 3583(d) is very specific about a few of these discretion conditions. For example, it provides that a court may condition an alien's supervised release upon his deportation and remaining outside the United States. It also authorizes a court, in the case of an offender required to register as a sex offender, to condition supervised release upon the offender's submission to warrantless, suspicionless searches by his probation officer, or with reasonable suspicion warrantless searches by any law enforcement officer. Section 3583(d) permits a wider range of specific conditions by adopting most of the probation discretionary conditions. Finally, it allows a court to impose any other appropriate condition as long as the condition is reasonably related to one of several sentencing goals and as long as it involves no greater deprivation of liberty than is reasonably necessary to accommodate those goals. The Sentencing Guidelines quote some of the statutorily identified discretionary conditions, suggest expanded versions of others, and propose additional considerations in still other situations. They divide the discretionary conditions into three groups—"standard" conditions, which courts impose as a matter of practice in most cases; "special" conditions that may be applied to particular kinds of cases; and "additional" conditions, such as community confinement, curfews, and occupational restrictions. For the most part, the Sentencing Guidelines replicate the probation conditions and standard conditions of supervised release. Courts regularly impose the Sentencing Guidelines' standard conditions as a matter of practice. Many of these conditions ensure that defendants remain in regular contact with their probation officers. For instance, they recommend that courts order defendants to report to a probation officer on a regular basis; allow their probation officer to visit them; respond honestly to their probation officer's questions and follow the officer's instructions; notify their probation officer of any change in address or employment; remain in the district unless the court or probation officer approves leaving; and notify their probation officer if they are arrested or questioned by law enforcement officers. Other standard conditions prevent criminal entanglements. For example, they recommend that courts require defendants to avoid criminal associations; illicit drug markets, stash houses, and crack houses; the use of illicit drugs or the excessive use of alcohol; and becoming an informant without permission of the court. A related condition requires a defendant to stay gainfully employed during the term of supervised release. The remaining standard conditions instruct defendants to honor specific or general legal obligations. For example, they recommend that courts require each defendant to support his family; pay any unpaid special assessment; advise his probation officer of circumstances that might prevent his making fine, restitution, or special assessment payments; and notify victims and those possibly at risk. The conditions which the statute refers to as "other" discretionary conditions, the Sentencing Guidelines divide into special and additional discretionary conditions. The so-called "special" discretionary conditions address case-specific factors, such as the nature of an offense, the defendant's character, or another condition contained in a defendant's sentence. For example, the Sentencing Guidelines recommend that a court ban possession of weapons during supervised release, if the defendant used a weapon in the commission of the crime at issue or had a record including prior felony convictions. Likewise, when a conviction is for a sex or child pornography offense or a defendant has a history of sexual misconduct, a court might mandate sex-offender treatment, limit computer use, or authorize warrantless searches of the defendant's possessions. Other special conditions based on a particular defendant's character or history include requiring participation in a drug or mental health treatment program based on a history of substance abuse or mental health problems or ordering deportation if the defendant is an alien who is eligible for deportation under immigration laws. In cases involving financial offenses, unpaid fees, or restitution orders, the Sentencing Guidelines recommend that a court prohibit a defendant from incurring new credit charges or opening additional lines of credit without approval of the probation officer unless the defendant is in compliance with his scheduled payments or mandate probation officers' access to a defendant's financial information. Moreover, when reasonably related to an offense, such conditions might include demands to provide information concerning the financial activities of a defendant's spouse or legal entities under the releasee's control. The Sentencing Guidelines identify other, "additional" conditions which address defendants' mobility and work activities. They include community confinement; home detention; community service; curfew; and restrictions on a defendant's occupation. Perhaps because many additional conditions restrict defendants' freedom of movement, commentary accompanying these additional conditions in the federal Sentencing Guidelines shows a special caution that such restrictions not become excessive.