Yeah Joe sounds like a bad situation. From what you said there were atleast a couple of violations. One being that in order to get a search warrant you must tell the judge exactly what you are searching for. In your case it should have been searching for your brother, thus making it illegal for the police to search anywhere that would be impossible for him to hide (drawers, suitcases) stuff of that nature. The fact that they threw your stuff around is not ethical or a correct code of conduct but altogether legal. The shot to the kidney once again is not right but as you said it would be really hard to get a lawyer to take the case, because all the police would have to see is that you resisted and it would make the use of force legal. Its really tough the power that is granted to the police does give much room for the over use of it. That is why the process to become a police officer is to tough, it is hoped that the bad ones are weeded up but unfortunatly some slip through.
Yeah Ozzy the gun on the table was a bad example, all police officers would take it for there saftey. A better example would have been if you seen the same gun through a glass case. The gun does not pose a threat because it was put away thus making illegal to pick it up and run the numbers w/o a search warrant.