Uhhhh.
I hope not.
The Flashbangs were developed in the mid-1970’s for Britain’s Special Air Service for use in anti-terrorist actions where they intended them to daze and incapacitate the enemy long enough for SAS Troopers to enter a room and kill them. They never really cared if the device caused harm to the terrorists, because they were going to die in a hail of gunfire in a few seconds anyway.
A little fact that seems to escape those who advocate their use in law enforcement actions these days.
I can see where they could be used by cops, but only in the most extreme of circumstances where deadly force is more or less already justified.