possible semen sample plus a blacklight situation:
Officer Michaels: "I often go to sleep and
dream of waking up in a world where everything's covered in semen."
Officer Slater: "I mean, who doesn't ?"
Officer Michaels: "It'd be nice. Like that crime
scene today."
Officer Slater: "Yeah."
Officer Michaels: "If the man had ejaculated and then punched you in the
face..."
Officer Slater: "Yeah."
Officer Michaels: "...we'd have a real good shot at catching him."
Officer Slater: "No
way."
Officer Michaels: "Just punched in the
face, no semen."
Officer Slater: "Yeah, no semen."
Officer Michaels: "Story of my life."