What is RSID-Saliva used for?

RSID-Saliva is a forensic screening test used to detect a protein commonly associated with human saliva.

It is an immunochromatographic test, meaning it uses antibodies to detect a specific biological marker — salivary amylase — that is present in high concentrations in saliva. The test is typically applied to swabs or extracts collected from items or body sites where saliva is suspected.

RSID-Saliva is used as an initial indication that biological material consistent with saliva may be present. It does not identify saliva directly and does not determine how or when the material was deposited.

Although considered more specific than some earlier screening methods, RSID-Saliva is not exclusive to saliva. Research has shown that it may also react with other forensically significant biological materials, including vaginal secretions, faeces, and urine. A positive result therefore indicates the presence of the targeted marker, not definitive proof of saliva.

DNA may sometimes be recovered from areas where RSID-Saliva testing is positive, but the presence of DNA does not confirm saliva as the source. DNA can originate from skin cells, transfer during handling, or prior contact.