Independent Forensics’ Rapid Stain Identification Semen Kit (RSID-Semen) is the first fluid specific test for the presence of semen. The kit is specific for human semenogelin antigens and will not cross-react with the myriad of other human body fluids that can cause false positives. The RSID Semen kit is designed to help crime laboratories correctly identify which samples from rape kits should go forward for DNA analysis.