A lot of crime scene terminology in Japanese, including:
Tape, string, gun, murder, case (as in murder case), police, ambulance, inspector, detective, famous, great (mei-[word]), car, suicide, blood (reinforced knowing the word), accident, culprit, rain, lawyer, mysterious, strange, pocket, PET bottle, sushi ginger, danger, etc.
Identifying and understanding Kansai-ben.
Allergies can be built up over time, usually appearing between the ages of 20-30. (Mysteries of Teitan Elementary episode)
Glass becomes reflective when it is dark behind it.
Strangulation leaves marks on the neck.
Scars don't grow as you age.
Luminol reacts to blood.
Potassium cyanide is not water soluble.