What term is used to describe an item that could be used to mislead investigators?

The term "decoy" refers to an object or item designed to mislead or distract investigators from the true purpose or situation at hand. Decoys are often employed with the intent to create a false narrative or to redirect attention away from more pertinent evidence or information. This usage is particularly relevant in investigations where the intention is to confuse or misdirect, rather than to provide clarity or assistance in solving a case.

In contrast, other terms like "red herring," while also related to misleading information, typically refer to a logical fallacy or distraction that serves to divert attention in discussions or arguments rather than specifically implying a physical object. "False flag" indicates actions meant to misrepresent the true affiliation or intention behind a situation, often in the context of covert operations or espionage, and wouldn't generally apply to a singular misleading item. "Plant" can indicate placing evidence or items in a location to mislead, but it is not as broad or general a term as "decoy" when referring specifically to misdirection in investigative contexts.

Thus, while all terms denote some form of misleading information or action, "decoy" most accurately captures the essence of an item specifically created to mislead investigators.