Boston Post, Massachusetts, December 26, 1920

Where Detectives Instead of Thieves Wear Masks.

The masked bandit, train robber, foot pad, et al., is familiar to us in fact and fiction, but the masked detective or police officer is a new one, indeed. This clever idea was adopted by the Los Angeles, Cal., police to prevent alleged crooks and gunmen from identifying plain clothes men while they are engaged in the work of identification themselves.