Non-motile sperm can be found for up to

• A. Up to 2 weeks.
• B. Up to 1-2 hours.
• C. Up to 3-6 days.
• D. Up to several months.

Answer: (C)

Non-motile sperm are detected by their structural remnants rather than by movement. After ejaculation, sperm that have lost motility can still be observed under a microscope in dried semen stains for several days. In typical forensic scenarios, the recognizable presence of non-motile sperm on clothes, bedding, or other surfaces tends to fall within a few days, commonly around 3 to 6 days, before the cells degrade beyond recognition.

The other timeframes don’t fit practical forensic observations: a couple of hours would reflect motility rather than detectable remnants; weeks or months would require unusually favorable preservation and are not the standard window for routine samples. So the best answer reflects the practical detection window for non-motile sperm in forensic samples.