In metro Atlanta Area, we had one just over a year ago, where:
The suspect wasn't home.
They had no idea where he was.
They didn't know who was in the home.
They performed no surveillance on the home.
There was no urgent need to confront and arrest the perp at that time.
Turns out an innocent family was visiting from out of state. Their ~2 year old child was sleeping in a playpen near the door. Busting in the door, they tossed in a flash bang grenade that landed in the playpen. No contraband was found.
Baby lived, but is scared for life.
The officers involved are mentally scared.
All resigned as LEOs.