Chicago police use 'heat list' as strategy to prevent violence

With the help of mathematical analysis, Chicago police hope to home in on people it believes are most at risk of shooting someone or being shot themselves. The strategy calls for warning those on the heat list individually that further criminal activity, even for the most petty offenses, will result in the full force of the law being brought down on them. At the same time, police extend them an olive branch of sorts, an offer of help obtaining a job or of social services.