Q 1) According to the below article, what has law enforcement learned from the Boston marathon's bombing in 2013?
https://www.nfpa.org/News-and-Research/Publications/NFPA-Journal/2017/May-June-2017/Features/Marathon
The Bombings at the Boston marathon in 2013 was a terrible affair. The pertinent question that arose after the incident was that no place and event is safe and the law enforcement agencies now have to make significant changes to prevent the recurrence of such a tragedy.