This is an overview of federal law relating to the statutes of limitation in criminal cases, including those changes produced by the act. The phrase "statute of limitations" refers to the time period within which formal criminal charges must be brought after a crime has been committed. "The purpose of a statute of limitations is to limit exposure to criminal prosecution to a certain fixed period of time following the occurrence of those acts the legislature has decided to punish by criminal sanctions. The common law recognized no period of limitation. Federal statutes of limitation are as old as federal crimes. Others suspend or extend the applicable period under certain circumstances such as the flight of the accused, or during time of war. Limits by Crime

Although the majority of federal crimes are governed by the general five-year statute of limitations, Congress has chosen longer periods for specific types of crimes—20 years for the theft of art work; 10 years for arson, for certain crimes against financial institutions, and for immigration offenses; and 8 years for the nonviolent terrorist offenses that may be prosecuted at any time if committed under violent circumstances. For example, an otherwise applicable limitation period may be suspended or extended in cases involving child abuse, the concealment of the assets of an estate in bankruptcy, wartime fraud against the government, dismissal of original charges, fugitives, foreign evidence, or DNA evidence. DNA

There are two DNA provisions. That is no longer the case. It provides the following:
(a)(1) Upon application of the United States, filed before return of an indictment, indicating that evidence of an offense is in a foreign country, the district court before which a grand jury is impaneled to investigate the offense shall suspend the running of the statute of limitations for the offense if the court finds by a preponderance of the evidence that an official request has been made for such evidence and that it reasonably appears, or reasonably appeared at the time the request was made, that such evidence is, or was, in such foreign country. Conspiracies and Continuing Offenses

Statutes of limitation "normally begin to run when the crime is complete," which occurs when the last element of the crime has been satisfied. The rule for conspiracy is a bit different. Thus, the statute of limitations for such conspiracies begins to run not with the first overt act committed in furtherance of the conspiracy but with the last. Constitutional Considerations

		Ex post Facto

Historically, constitutional challenges to the application of various statutes of limitation have arisen most often under the ex post facto or due process clauses. Due Process

Retroactivity aside, the due process clauses may be implicated when a crime has no statute of limitations or when the period of limitation has not run. Attachment 1. § 2250 (failure to register as a sex offender)
18 U.S.C.
A statute of limitations dictates the time period within which a legal proceeding must begin. The purpose of a statute of limitations in a criminal case is to ensure the prompt prosecution of criminal charges and thereby spare the accused of the burden of having to defend against stale charges after memories may have faded or evidence is lost.
There is no statute of limitations for federal crimes punishable by death, nor for certain federal crimes of terrorism, nor for certain federal sex offenses. Prosecution for most other federal crimes must begin within five years of the commitment of the offense. There are exceptions. Some types of crimes are subject to a longer period of limitation; some circumstances suspend or extend the otherwise applicable period of limitation.
Arson, art theft, certain crimes against financial institutions, and various immigration offenses all carry statutes of limitation longer than the five-year standard. Regardless of the applicable statute of limitations, the period may be extended or the running of the period suspended or tolled under a number of circumstances, such as when the accused is a fugitive or when the case involves charges of child abuse, bankruptcy, wartime fraud against the government, or DNA evidence.
Ordinarily, the statute of limitations begins to run as soon as the crime has been completed. Although the federal crime of conspiracy is complete when one of the plotters commits an affirmative act in its name, the period for conspiracies begins with the last affirmative act committed in furtherance of the scheme. Other so-called continuing offenses include various possession crimes and some that impose continuing obligations to register or report.
Limitation-related constitutional challenges arise most often under the Constitution's ex post facto and due process clauses. The federal courts have long held that a statute of limitations may be enlarged retroactively as long as the previously applicable period of limitation has not expired. The Supreme Court recently confirmed that view; the ex post facto proscription precludes legislative revival of an expired period of limitation. Due process condemns pre-indictment delays even when permitted by the statute of limitations if the prosecution wrongfully caused the delay and the accused's defense suffered actual, substantial harm as a consequence.
A list of federal statutes of limitation in criminal cases and a rough chart of comparable state provisions are attached. This report is available in an abbreviated form as CRS Report RS21121, Statute of Limitation in Federal Criminal Cases: A Sketch, without the attachments, footnotes, or attributions to authority found here.