What high school subjects help in becoming a crime scene investigator?

All of the physical science courses you can take in high school would help. AP Biology, AP Chemistry, Physics, Organic chemistry and Anatomy & Physiology would all be helpful. Also, Psychology, Sociology, Human Behavior are all helpful. Some of those courses require math including at least up to Pre-Calculus and Statistics.

In most areas, many of these courses are not offered by your high school. However, many states have programs to allow high school students to take Community College courses for credit.