What is the relationship between legality and objectivity of evidence?

It is generally believed that evidence has three characteristics: objectivity, relevance and legitimacy.

Objectivity refers to the objective existence of evidence materials bearing the facts of a case, regardless of human will.

Legality means that the source, subject, verification procedure and form of evidence must be legal.

If objectivity is the attribute of evidence itself, then legitimacy belongs to the attribute given by law because of its value orientation.

The court's examination of evidence mainly focuses on three characteristics of evidence, one of which will not be accepted by the court.