Moisten the included swab with water and rub it on the crusty residue of the suspected semen stain. While each test is slightly different, most follow the same procedure. Open your sperm detection kit and read through the instructions. Home test kit (we recommend Semen Detection Test Strips or Check Mate Infidelity Test Kit).You can also use a Prostate Specific Antigen (PSA) test to refine the results, but this isn’t completely conclusive either. While this type of test can detect sperm, it is not conclusive because AP is also present in other bodily fluids. They use a test strip to detect small amounts of sperm on underwear, bedding, hard surfaces, and more.Īn AP semen detection kit tests fabric for acid phosphatase (AP), an enzyme in sperm and vaginal stains. Method 3: At-Home Semen Detection KitĪt-home semen detection kits come in two simple-to-use varieties. If the residue is semen, it will light up and look yellow or blue. Now that your DIY black light is ready, turn on your phone’s camera light. Step 4: Hold the Camera Light Over the Stain This time, color it with a purple permanent marker. Step 3: Add a Third Layer of Tape and ColorĪdd another layer of tape. Layer another piece of tape over the first. Then, color the tape with a blue permanent marker. Stick a strip of tape over the camera light on your phone. Step 1: Place Tape Over Your Phone’s Camera Light and Color Steer clear of black light phone apps because they simulate a black light, but they do not mimic the actual effects of a black light. You can also make a DIY black light with your phone to detect sperm stains on underwear, bedding, and other materials. Even oils from food and cosmetics can glow under UV lights, so the results are not conclusive. However, other substances and dried stains from bodily fluids like blood, sweat, saliva, vaginal secretions, and urine also light up under a black light. With most black light lamps, sperm will appear yellow or blue, but it may vary based on the specific lamp you are using. If the dried fluid is sperm, it will light up under the lamp. Hold your UV-A light over the surface with the suspected semen stain. Step 3: Hold the Black Light over the Stain If you have a light bar model, plug it in and power it up. If you have a flashlight model, simply switch it on. It must be dark to see the reaction between the UV-A lamp and the surface with the stain. Start by turning off the lights in the room. The ease of use and portability of a UV-A light also make it a top choice for criminal investigators trying to find body fluid.Ī UV-A or black light is all you need for this. ![]() You can use it on clothing, underwear, bedding, and other surfaces. This method is simple to execute and hands-off. This is because sperm stains typically light up when exposed to the fluorescence of a black light. Method 1: Use a Black LightĪ black light, also called a Wood’s lamp or UV-A light, produces a blue light that you can use to detect semen. Use the following methods to determine whether the suspected spot is semen ejaculation. Detecting Sperm Stains: Methods and InstructionsĪ crusty, shiny, or stiff stain that appears gray, off-white, or light yellow might be evidence of ejaculation or sperm. Black lights are the most popular method, even for the Department of Justice, but there are other options that offer more conclusive results. You can identify semen stains using black lights, at-home test kits, and more technical testing methods. ![]() ![]() Learning how to detect sperm stains helps you treat them properly.
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