In the common law tradition, an acquittal formally certifies the accused is free from the charge of an offense, as far as the criminal law is concerned. This is so even where the prosecution is abandoned nolle prosequi. Under the rules of double jeopardy and autrefois acquit, an acquittal operates to bar the retrial of the accused for the same offense, even if new evidence surfaces that further implicates the accused. The effect of an acquittal on criminal proceedings is the same whether it results from a jury verdict, or whether it results from the operation of some other rule that discharges the accused.

Scots law has two acquittal verdicts: not guilty and not proven. However a verdict of "not proven" does not give rise to the double jeopardy rule.

In England and Wales, which share a common legal system, the Criminal Justice Act 2003 creates an exception to the double jeopardy rule, by providing that retrials may be ordered if "new and compelling evidence" comes to light after an acquittal for a serious crime. Also the Criminal Procedure and Investigations Act 1996 permits a "tainted acquittal" to be set aside in circumstances where it is proved beyond reasonable doubt that an acquittal has been obtained by violence or threats of violence to a witness or juror/s.

Caylee Marie Anthony (August 9, 2005 – 2008) was an American two-year-old girl who was reported missing in Orlando, Florida, in July 2008, whose skeletal remains were found in a wooded area near her home in December 2008. Her then 22-year-old mother, Casey Marie Anthony, was tried for the first degree murder of Caylee but was acquitted. She was, however, convicted of misdemeanor counts of providing false information to police officers.

Caylee lived with her mother, Casey, and her maternal grandparents, George and Cindy Anthony. On July 15, 2008, Caylee was reported missing to 9-1-1 by Cindy, who said she had not seen Caylee for 31 days and that Casey's car smelled like a dead body had been inside of it. She said Casey had given varied explanations as to Caylee's whereabouts and finally admitted that day that she had not seen her daughter for weeks. Casey fabricated various stories, including telling detectives the child had been kidnapped by a fictitious nanny on June 9, and that she had been trying to find her, too frightened to alert the authorities. With the child still missing, Casey was charged with first degree murder in October and pled not guilty. On December 11, Caylee's skeletal remains were found with a blanket inside a trash bag in a wooded area near the family home. Investigative reports and trial testimony alternated between duct tape being found near the front of the skull and on the mouth of the skull. The medical examiner mentioned duct tape as one reason she ruled the death a homicide, but officially listed it as "death by undetermined means".

Adidja Palmer (born 7 January 1976)- better known as Vybz Kartel, is a Jamaican dancehall artist, songwriter and businessman. He has many nicknames, including: Addi, The Teacher, World Boss, Kartel, Vybz, Gaza General and Gaza Don.

Adidja Palmer began his career as a teenager in 1993 with his first recording "Love Fat Woman", released on Alvin Reid's label "One Heart", using the moniker "Adi Banton", a homage to Buju Banton. Palmer was later part of the three-member group "Vybez Cartel", keeping the slightly altered name after group split up, and became a protege of Bounty Killer, for whom he claims to have written nearly 30 songs, including "Gal Clown".

Vybz Kartel rose to prominence in 2003 after a string of hits in Jamaica. The year culminated in a pre-planned on-stage clash with Ninjaman at the annual dancehall festival Sting in Kartel's hometown of Portmore. The clash turned violent when Kartel's crewmembers, as well as Kartel himself, threw punches and assaulted Ninjaman onstage. While Kartel's manager initially blamed Ninjaman for the fracas, Kartel himself quickly apologised to Ninjaman and Sting organizers for the fracas. Four days after the incident, the two artists appeared before the press to announce a settlement of their differences and to end any animosity.

The fatal shooting of Trayvon Martin by George Zimmerman took place on February 26, 2012, in Sanford, Florida, United States. Trayvon Martin was a 17-year-old African American male who was unarmed. George Zimmerman was a 28-year-old multi-racial Hispanic American, who was the community watch coordinator for the gated community where the shooting took place.

While on a private errand, Zimmerman saw Martin walking inside the gated community where Martin and his father were visiting his father's fiancée. Zimmerman called the Sanford Police Department to report Martin's behavior as suspicious. Shortly afterwards, there was an altercation, which ended with Zimmerman fatally shooting Martin once in the chest at close range.

When police arrived on the scene Zimmerman told them that Martin had attacked him and that he had shot Martin in self-defense. Zimmerman was bleeding from the nose and two vertical lacerations on the back of his head.EMTs treated Zimmerman at the scene, after which he was taken to the Sanford Police Department. Zimmerman was detained and questioned for approximately five hours. A statement was videotaped, and he was then released without being charged. Police said that they had not found evidence to contradict his assertion of self-defense.

Amanda Marie Knox (born July 9, 1987) is an American woman who was accused of the murder of Meredith Kercher in Perugia, Umbria, Italy. She served four years of a 26-year sentence before the murder conviction was overturned on October 3, 2011. Raffaele Sollecito, Knox's boyfriend at the time of the murder, was also accused of the murder and had his conviction overturned on appeal. The jury upheld Knox's calunnia conviction for falsely implicating bar owner Patrick Lumumba. For this Knox was sentenced to three years in prison, which she had already served, and was ordered to pay Lumumba's court costs of about 22,000 euros.

Knox was born in Seattle, Washington, to Edda Mellas, a math teacher, and Curt Knox, a vice president of finance at Macy's. The couple divorced when Knox was a toddler. Knox attended Seattle Preparatory School, from which she graduated in 2005. In 2005 she began studies at the University of Washington.

In 2007 Knox moved to Perugia, Italy, to study Italian, German, and creative writing at the University for Foreigners for one year. She shared a house with Meredith Kercher, a student from England, as well as two Italian women. In mid-October 2007 she began a romantic relationship with an Italian engineering student, Raffaele Sollecito, from Bari, Apulia.