Why is bleach used to clean up a crime scene?

Question

I’ve seen this in multiple movies/shows where they just dumb bleach on everything. What does it actually do?
Does it erase things like finger prints?

In: Chemistry

Answer 1

Investigators use luminol to identify trace amount of blood under a uv lamp. Bleach will also appear the same as blood under the lamp, so you wouldn’t be able to tell what was bleach and what was cleaned up blood.