The Rapid Stain Identification (RSID®) is a confirmatory test. It is done by means of a kit that contains an extraction/running buffer, water for swab wetting, swabs, scissors, transfer pipettes, tube rack, protocols, and RSID™-Semen strip tests. This test uses antibodies that are specific for specific for human semenogelin on an immunochromatographic strip to confirm the presence of a component of seminal fluid, Semenogelin. It should be carried out whenever a presumptive test gives a positive result. The RSID test is very accurate and specific for human semen testing and will even prove effective in diluted samples of semen, semen mixed with other body fluids or the presence of fungi or bacteria — in other words, the semen test will not cross react. This is indeed an advantage as in cases of assault, cross reactivity between similar proteins (body fluids containing similar components) occurs frequently, and avoiding contamination between body fluids that may lead to inaccurate/ false positive or false negative results could pose problems.