I took a use of force course from the criminal justice department in college. What they said is that originally (maybe until sometime in the 40s?) it was legal

I took a use of force course from the criminal justice department in college. What they said is that originally (maybe until sometime in the 40s?) it was legal for police to shoot a fleeing suspect if the crime was a felony. That has since changed and it is now only legal to shoot a fleeing suspect if they pose an immediate safety threat. For example, if the suspect was armed and fleeing into a populated area.