Which element is NOT part of the criteria for wielding a knife in public places?

The element that is not part of the criteria for wielding a knife in public places is that the knife must be of a specific length. In legal contexts regarding knives in public spaces, the focus tends to be on the visibility of the knife, whether it is actively being used by the accused, and the potential effects of that usage on the safety and well-being of others in the vicinity. The law typically does not specify a maximum or minimum length for knives, but it might regulate the manner in which they are displayed or used.

This understanding is based on the broader principles of public safety and the legal frameworks that address aggressive behavior and the intent to intimidate or harm. The importance lies in the context of how the knife is being used and perceived rather than strict measurements. Thus, the question correctly identifies that a specific knife length is not a criterion for evaluating the legality of wielding a knife in public.