A crime scene. No witnesses. No confession. But somewhere on a stained bedsheet lies an invisible piece of evidence – one that doesn't wash away.
Detective Lara learned this years ago. A young woman reported a sexual assault, but the suspect claimed nothing happened. The fabric had been laundered. Standard tests found no sperm. The case seemed hopeless.
Then Lara used the Human Semen Rapid Test Strip. In minutes, a colored line appeared – positive for Prostate Specific Antigen (PSA). PSA is a protein found in semen, even when no sperm are present. It survives washing, decomposition, even formalin fixation. That tiny strip gave the victim her voice back.
How does it work?
It's a simple strip, like a pregnancy test but for forensics. You add a tiny sample from a suspected semen spot. The strip contains antibodies that hunt for PSA. If the level reaches 4 ng/ml or higher, a test line appears. A control line always shows up, confirming the test worked.
Why PSA?
Unlike sperm, PSA doesn't disappear if the attacker is vasectomized or infertile. It stays strong on fabrics, skin, or objects – even after days or environmental exposure. Scientists have proven its reliability in living victims, deceased bodies, and decomposed remains. That's why PSA is the gold standard for proving ejaculation occurred.
For professionals only.
This test is designed for forensic labs and medical examiners. It's rapid, easy, and gives answers when every minute counts in an investigation.
Sexual assault is often an invisible crime. But with tools like this rapid strip, truth leaves a mark – no matter how hard someone tries to erase it.
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