How do I know if the police violated my rights during a no knock search warrant?

My sisters boyfriend was supposedly dealing drugs and he lives at my house. The police said they had been buying prescription drugs from him. The broke down the door and tore apart the whole house rather than just the room he lived in, including throwing stuff on top of my 6month old nephew because they didn't see him. They eventually found some paraphanalia in his room and arrested him. They destroyed every room though, basically just flipped drawers. They also found an ounce of old homegrown marijuana in my mother's room. So far the court date has not come yet but my sisters boyfriend has been happily out of jail for a bit despite him being on probation, which lead me to believe they found nothing of consequence. I am worried about my mother, the horrible trauma, and all of the things they broke. BTW, they broke the door at about 12am and threw a flash grenade.