Some experts say there are potential problems with how the Chicago Police Department tracks suspected gang members.

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University of Chicago law Professor Aziz Huq added that there is nothing illegal about police compiling a list of suspected gang members. But he sees a potential constitutional violation if the database is actually used for policing.

“It’s an open question of law whether inclusion in a gang database is a lawful basis for a street stop,” Huq said. “The idea that police can treat you as suspicious because police believe you are suspicious, that just seems circular to me. There is no independent corroboration.”

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