False accusations (or groundless accusations or unfounded accusations or false allegations or false claims) can be in any of the following contexts:
When there is insufficient supporting evidence to determine whether an accusation is true or false, it is described as "unsubstantiated" or "unfounded". Accusations that are determined to be false based on corroborating evidence can be divided into three categories:
A false allegation can occur as the result of intentional lying on the part of the accuser; or unintentionally, due to a confabulation, either arising spontaneously due to mental illness or resulting from deliberate or accidental suggestive questioning, or faulty interviewing techniques. Researchers Poole and Lindsay suggested in 1997 applying separate labels to the two concepts, proposing the term "false allegations" be used specifically when the accuser is aware they are lying, and "false suspicions" for the wider range of false accusations in which suggestive questioning may have been involved.
When a person is suspected of a wrongdoing for which they are in fact responsible, "false accusation may be used to divert attention from one's own guilt". False accusation may also arise in part from the conduct of the accused, particularly where the accused engages in behaviors consistent with having committed the suspected wrongdoing, either unconsciously or for purposes of appearing guilty.
Additionally, once a false accusation has been made – particularly an emotionally laden one – normal human emotional responses to being falsely accused (such as fear, anger, or denial of the accusation) may be misinterpreted as evidence of guilt.
A false accusation of rape is the intentional reporting of a rape where no rape has occurred. It is difficult to assess the prevalence of false accusations because they are often conflated with non-prosecuted cases under the designation "unfounded." However, in the United States, the FBI Uniform Crime Report in 1996 and the United States Department of Justice in 1997 stated 8% of rape accusations in the United States were regarded as unfounded or false. Studies in other countries have reported their own rates at anywhere from 1.5% (Denmark) to 10% (Canada). Due to varying definitions of a "false accusation", the true percentage remains unknown.
A false allegation of child sexual abuse is an accusation that a person committed one or more acts of child sexual abuse when in reality there was no perpetration of abuse by the accused person as alleged. Such accusations can be brought by the victim, or by another person on the alleged victim's behalf. Studies of child abuse allegations suggest that the overall rate of false accusation is under 10%, as approximated based on multiple studies. Of the allegations determined to be false, only a small portion originated with the child, the studies showed; most false allegations originated with an adult bringing the accusations on behalf of a child, and of those, a large majority occurred in the context of divorce and child-custody battles.