Answer:
Class characteristic
Is referred to as the attribute of evidence that can only be linked to a group and not an individual source. It entails an estimated characteristic of an item that reflects a limited group source reliant on design characteristic expressed prior to manufacture. E.g. Width of the tip of a screwdriver found at a chrome scene e.t.c.
Although there are barriers to class characteristics of evidence, it still have some advantages as it help investigators piece in unity the crime and it permits jurors the insight to likey link a suspect to the scene of a crime as a large portion of the pieces of evidence in the courtroom, ranging from the witnesses to documents, are till an extent somewhat subject to subjective examination. In these situations, the entirety of the case becomes stronger and more valuable than the individual pieces of proof.