SPRINGFIELD — A study of racial profiling during police stops is set to end in July, but some lawmakers are working to keep the study going.House Bill 1613 would remove the sunset provision for the 15-year traffic and pedestrian stop data collection initiative that was originally sponsored by then-state senator Barack Obama in 2004.The measure required police officers to track a driver’s race and the stop’s outcome. It was later amended to include pedestrian stops and dog-sniffing searches. Now, lawmakers …