You are asked to examine a vaginal swab from an alleged sexual assault. The presumptive test for semen is positive, but microscopic examination reveals no presence of spermatozoa:Assuming further tests determine the presence of seminal fluid on the swab, explain possible reasons for the absence of spermatozoa
You have just obtained an item of evidence from the evidence locker. The brown paper package with intact evidence seals appears soggy at one end and there is a strong odor associated with it. On opening the evidence bag you see what appears to be a blood soaked item of clothing that has been wrapped […]