Jesus Rafael Chavez faces two counts of having a concealed firearm and one count of vandalism over $400. His case includes an allegation of being armed with a handgun.
The Lynwood man pleaded not guilty during his arraignment and is scheduled to return to court Sept. 25.
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Police said Chavez prompted an active-shooter scare at the facility on Tuesday.
Witnesses said he was upset over a missed appointment, pulled a gun and threw a chair through a window at one point.
Investigators said no shots were ever fired and Chavez surrendered.