how do investigators find “what caused the fire?” Or “what caused the shuttle to explode?” Or any root cause of some event where much or all of the evidence has seemingly been destroyed?

Question

how do investigators find “what caused the fire?” Or “what caused the shuttle to explode?” Or any root cause of some event where much or all of the evidence has seemingly been destroyed?

In: Other

Answer 1

Certain things cannot be destroyed by others. Chemical traces are usually the main thing, but there are many other ways of determining it as well. Just to go off what your example was, a fire, could have an explosion site, and also you can typically tell where the longest burning part of the fire was. If it’s burnt to the ground, it’s a crap shoot and just testing tons of the remains.