What are the four types of evidence in a criminal investigation?

( give details) (forensic science btw)

In a criminal investigation, there are four types of evidence that are Physical evidence, Testimony evidence, Demonstrative evidence and Documentary evidence.

Explanation:

A type of evidence that is touchable and it is a real object, this type of evidence is called Physical evidence.

In Documentary evidence we would find letters, treatments, receipts etc.  

Demonstrative evidence applies to media information like photographs, tape, recording, films, email, spreadsheets etc.

Testimony evidence is collected from an observer who declares the fact. These are the four types of evidence we can get from in a criminal investigation.