A shooting that left four people dead on a Chicago Transit Authority (CTA) Blue Line train on Monday came just days after the CTA announced a new pilot program designed to detect guns on agency property before they're used. WBBM's Terry Keshner has been talking to CTA riders, and he's live on the newsline from Forest Park with the update.

Photo credit Terry Keshner

<p>A shooting that left four people dead on a Chicago Transit Authority (CTA) Blue Line train on Monday came just days after the CTA announced a new pilot program designed to detect guns on agency property before they're used. WBBM's Terry Keshner has been talking to CTA riders, and he's live on the newsline from Forest Park with the update.</p>
<p>Photo credit Terry Keshner</p>

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