BROCKTON, Mass. — Brockton police are investigating a non-fatal shooting early on Thanksgiving Day.The Enterprise reports that the victim was found hiding near the MBTA Commuter Rail tracks with a gunshot wound to the left foot on Thursday morning.Police investigated after getting several calls from residents and an alert from the city's electronic gunfire detection system just after 4 a.m.Officers recovered six .45-caliber shell casings from the scene.