An arrest made by a guard who has not been deputized is classified as what?

When a security guard who has not been officially deputized makes an arrest, that action falls under the classification of a citizen's arrest. This is based on the legal principle that any private individual has the right to detain someone they believe has committed a crime, provided they act within certain legal bounds.

In general, for a citizen's arrest to be valid, the individual making the arrest must have witnessed the crime being committed or have reasonable grounds to believe that the person they are detaining has committed a felony. This type of arrest is permissible in many jurisdictions and is often used as a measure to protect the safety of the community when law enforcement officers are not readily available.

The other classifications mentioned do not apply in this context. A conservator's arrest is not a recognized term in legal terminology related to arrests; an illegal arrest refers to an unlawful detention without proper authority or justification; and a detention is typically a temporary holding of someone without necessarily implying that an arrest has taken place. Thus, the most appropriate classification for an arrest made by a non-deputized guard is indeed a citizen's arrest.