Swabbing for bodily fluid samples (saliva, semen, blood) reveals evidence that may identify or eliminate a suspect as well as the nature of the sexual activity that took place.
Establishing the victim's levels of alcohol, prescription, recreational, or unknown drugs by taking urine and blood samples can support an assertion of lack of capacity to consent to sexual activity.
This type of evidence can include paper records and digital records categorized as either public, judicial or private documents such as: DNA profiling is used by crime laboratories for testing biological evidence, most commonly by means of the polymerase chain reaction (PCR), which allows analysis of samples of limited quality and quantity by making millions of copies.
In one case Dr. John Schneeberger, who raped one of his sedated patients and left semen on her underwear, surgically inserted a Penrose drain into his arm and filled it with foreign blood and anticoagulants.
Advocates have for decades campaigned to governments and supreme courts to change laws and set legal precedents in order to facilitate a higher rate of rape charges and criminal convictions.
These campaigns have resulted in legal changes across the common-wealth legal systems including broadening the criminal code definition of rape and sexual assault to include acts such as unwanted hugging, kissing or touching, removing the requirement to provide verifiable corroboration that a crime occurred, and changing the statute of limitations to allow more allegations of historical rape or sexual assault to be prosecuted.
The campaigning has also led the U.K.'s justice department to issue guidance primarily aimed at police officers in planning and conducting interviews with alleged adult and child sexual violence victims.
[12] Recent coitus can be determined by performing a vaginal wet-mount microscopy examination (or oral/anal if indicated) for detection of motile sperm, which are seen on the slide if less than three hours have elapsed since ejaculation.