The number of false rape allegations in the studied period was 45; this was 41% of the 109 total complaints filed in this period.
The researchers verified, whenever possible, for all of the complainants who recanted their allegations, that their new account of the events matched the accused's version of events.
Of these, police departments classified 8% as false reports.
The researchers noted that some of these classifications were based simply on the personal judgments of the police investigators and were made in violation of official criteria for establishing a false allegation.
That conclusion would have been based not on a single interview, or on intuitions about the credibility of the victim, but on a "preponderance" of evidence gathered over the course of a thorough investigation." A study of 850 rape accusations made to police in Victoria Australia between 20 found that 2.1% were ultimately classified by police as false, with the complainants then charged or threatened with charges for filing a false police report.
Rumney draws two conclusions from his review of literature. (2003), HMCPSI/HMIC (2002), Harris and Grace (1999), Smith (1989), and others found that police decisions to no-crime were frequently dubious and based entirely on the officer's personal judgment.
FBI reports from 1995, 1996, and 1997 consistently put the number of "unfounded" forcible rape accusations around 8%.
He adds that "qualitative research also suggests that some officers continue to exhibit an unjustified scepticism of rape complainants, while others interpret such things as lack of evidence or complaint withdrawal as 'proof' of a false allegation".A thorough investigation would involve, potentially, multiple interviews of the alleged perpetrator, the victim, and other witnesses, and where applicable, the collection of other forensic evidence (e.g., medical records, security camera records).For example, if key elements of a victim's account of an assault were internally inconsistent and directly contradicted by multiple witnesses and if the victim then altered those key elements of his or her account, investigators might conclude that the report was false.Mac Lean deemed reports "false" if, for instance, the victim did not appear "dishevelled" and Stewart, in one instance, considered a case disproved, stating that "it was totally impossible to have removed her extremely tight undergarments from her extremely large body against her will". Attrition in reported rape cases" was the largest and most rigorous study to date commissioned by the British Home Office on UK rape crime, from the initial reporting of a rape through to legal prosecutions.The study was based on 2,643 sexual assault cases (Kelly, Lovett, and Regan, 2005).