Year and a day rule
The year and a day rule has been a common traditional length of time for establishing differences in legal status.
The phrase "year and a day rule" is associated with the former common law standard that death could not be legally attributed to acts or omissions that occurred more than a year and a day before the death.
It is elsewhere associated with the minimum sentence for a crime to count as a felony.
The rule and homicide
In English common law, it was held that a death was conclusively presumed not to be murder (or any other homicide) if it occurred more than a year and one day since the act (or omission) that was alleged to have been its cause. The rule also applied to the offence of assisting with a suicide.
Certain problems with this rule arise from the advance of medicine. Life support technology can extend the interval between the murderous act and the subsequent death. Application of the year and a day rule prevented murder prosecutions, not because of the merits of the case, but because of the successful intervention of doctors in prolonging life. Additionally, advances in forensic medicine may assist the court to determine that an act was a cause of death even though it was carried out fairly far in the past.
England and Wales
The rule was abolished by the Law Reform (Year and a Day Rule) Act 1996. English law is now substantially revised such that if a specific act can be proved to be the cause of death, it can now potentially constitute murder regardless of the intervening time. The abolition of the rule does not relieve the prosecution of its obligation to prove, in cases of murder, that the accused intended to cause either death or serious injury.
The permission of the Attorney General is required for any prosecution in which it is alleged that the death occurred more than three years after the causative act, or when the offender has previously been convicted of an offence in connection with the death.
The rule's status in the United States is less clear: many states have abolished it completely, and in 2001 the Supreme Court held that a Tennessee court's retroactive abolition of the rule was constitutional. However, the rule's common law status has been successfully used by defendants to overturn convictions as recently as 2003: the Supreme Court of Wisconsin upheld the year and a day rule in the case before it, but simultaneously abolished the rule for any later cases, noting the modern circumstances of homicide cases, in which there is "the specter of a family's being forced to choose between terminating the use of a life-support system and allowing an accused to escape a murder charge" and the court's finding that it is "unjust to permit an assailant to escape punishment because of a convergence of modern medical advances and an archaic rule from the thirteenth century".
In California, the "year and a day" rule has been changed to a "three years and a day" rule. If a death occurs more than three years and one day after the act alleged to have caused it, there is "a rebuttable presumption that the killing was not criminal", but the prosecution may seek to overcome this presumption.
Where the rule is not applied to homicide
Jurisdictions where the rule has never applied
The following countries are listed in the Report on the Year and a Day Rule in Homicide with the observation that "the rule has never applied":
- It should be noted that the report also said “It was held in H.M. Advocate v Stewart that the Crown may be barred from proceeding with a trial if it would be oppressive for them to do so in view of the passage of time since the discovery of the offence.".
- South Africa
Jurisdictions where the rule has been abolished
- England and Wales
- See the main introduction above.
- The rule was abolished “for all purposes” including "for the purposes of offences involving the death of a person, and for the purpose of determining whether a person committed suicide" by the section 38 of the Criminal Justice Act 1999.
- Hong Kong
- The Rule was abolished “for all purposes" in Hong Kong by s.33 Offences Against the Person Ordinance (added by Ordinance No.32 of 2000) following the recommendation of the Law Commission of Hong Kong; the Commission did not consider it necessary to set a time limit beyond which prosecutions required the consent of the Secretary of Justice.
As a sentence for felons
A year and a day is a minimum incarceration sentence for felonies in many jurisdictions, and is one of the main features distinguishing felonies from misdemeanors. For some crimes, this is the minimum penalty, as traditionally in English-speaking, common law countries, misdemeanors may not entail a sentence of more than a year (hence, "eleven months and twenty-nine days") whereas felonies are traditionally punished by incarceration of over one year, hence "a year and a day." Furthermore, in many jurisdictions, prisoners are eligible for parole only if their sentences are longer than a year; by imposing a sentence of a year and a day, judges can offer defendants a chance at parole. In the United States federal system, only sentences of more than one year allow prisoners to obtain early release for good time while incarcerated.  As a result, a sentence of a year and a day can lead to less time served than a sentence of a year.
- "Crimes Act 1961 No 43, part 8, sec. 162". New Zealand. 2009-12-09. Retrieved 2010-03-12.
- Rogers v. Tennessee, 532 U.S. 451 (2001).
- State v. Picotte, 2003 Wisc. 42, ¶ 35 (2003). Summarized in "Supreme Court Digest: Homicide - Year-and-a-Day Rule Abrogated". Wisconsin Lawyer (Madison, Wisconsin: State Bar of Wisconsin) 76 (7). July 2003.
- Report on the Year and a Day Rule in Homicide, The Law Reform Commission of Hong Kong, June 1997.
- California Penal Code, Section 194.
- Criminal Law in Hong Kong [Michael Jackson, pub. Hong Kong University Press 2003]
- 18 U.S.C. § 3624(b)(1), http://www.law.cornell.edu/uscode/text/18/3624.
- Criminal Law: Eighth Edition, Smith & Hogan, Butterworths, ISBN 0-406-08187-5
- Official text of the Law Reform (Year and a Day Rule) Act 1996 as in force today (including any amendments) within the United Kingdom, from the UK Statute Law Database