Police forces nationwide need a reality check

    One of the unsung blessings of Twitter is the way it continually reminds us that willful ignorance is alive and thriving in the American body politic.

    In the past week, we were treated to widely retweeted photos purporting to show Capt. Ron Johnson of the Missouri Highway Patrol throwing a gang sign. The first controversial image showed up on an unvetted CNN social media webpage called iReport, and Internet trolls took it from there.

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