FBI uses facial recognition technology, online photos to identify and arrest ICE Portland protester The criminal complaint lists a pink gas mask and a forearm tattoo as distinct clues that led investigators to use third-party software to help make an arrest.

“Technology has transformed the act of being in public,” Crump said. “People who engage in political protests need to understand that it’s very difficult to do that anonymously.”

Since June, 23 people have been arrested on charges connected to ICE protests in Southeast Portland.