{Reference Type}: Journal Article {Title}: Challenging Pennsylvania's Firearm Preemption Law as a Public Health Danger: The Case of Philadelphia. {Author}: Jarrah S;Geffen B;Babiarz G;Hartung B;Cook A;Todd M; {Journal}: J Law Med Ethics {Volume}: 52 {Issue}: 0 {Year}: 2024 {Factor}: 1.604 {DOI}: 10.1017/jme.2024.66 {Abstract}: Firearm violence has soared in American cities, but most states statutorily preempt municipal firearm regulation. This article describes a unique collaboration in Philadelphia among elected officials, public health researchers, and attorneys that has led to litigation based on original quantitative analyses and grounded in innovative constitutional theories and statutory interpretation.