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The CheckMate Semen and "Sperm" Detection Test Kit is the easiest and most cost effective way to put an end to the nightmare of suspicion and doubt caused by the infidelity of a cheating spouse or of a sexually active teen. Quickly, easily, and accurately detect and identify semen in undergarments in 5 minutes or less. The Check Mate Infidelity Test Kit tests 5-10 articles of clothing for the presence of semen and works on any type or color of material. Check Mate also provides instant results without damaging or staining the article being tested. If any traces of semen are present on the area you decide to test, even in the smallest trace amounts, the CheckMate Semen Detection Test Kit will detect it. Invisible traces of dried semen can easily be detected for up to 2 years.