What is the most critical piece of evidence that is used today in forensics?

Physical evidence is the most critical piece of evidence that is used today in forensics.

Explanation:

Evidence, such as items found on-site, is called physical evidence. The physical evidence is hand prints, footprints, fingerprints, cut marks, tidemarks, tool marks and so on. They are carefully collected and analyzed in the laboratory using forensic methods.

According to criminal law, this physical evidence is the king and not biased. It exists despite all expectations and desires. For this reason, it is very important that physical evidence has to be found, uncontaminated, and properly examined.