Sperm can be detected on clothes for a surprisingly long time, even more than a year. This is because dried secretions on clothing remain stable and can be detected using various methods, including DNA analysis.
Here's a breakdown of what research shows:
- DNA profiles from laundered semen stains have been recovered at least 8 months after deposition. This suggests that even after washing, evidence can still be present.
- Microscopic examination of semen-stained underwear becomes inadequate after two weeks. This indicates that while visible traces might disappear, DNA evidence can persist.
- Semen detection test strips can give instant results, indicating the presence of semen on clothing.
- Alternative light sources can help detect body fluids like semen on clothing, even when it's not visible to the naked eye.
The exact duration for which sperm can be detected depends on factors like the type of fabric, storage conditions, and the specific detection method used. While microscopic examination may become less reliable over time, DNA analysis offers a longer window for detecting evidence.
