Philadelphia is suing state of Pennsylvania so it can enact stronger gun control laws, as at least 391 people have been murdered in the city so far this year. Philly has tried this before — in 2007, the city sued the state for preempting local gun laws and failing to take action on gun violence, without success. There were 391 homicides in the city that entire year. WHYY criminal justice reporter Aaron Moselle and Billy Penn’s Layla A. Jones explain why attorneys hope a new legal strategy involving something called the “state-created danger” doctrine could help the city win this time.