Unless you are being charged with a crime, it sounds as if this does not involve you. The DA can use some, none, or all of the items seized (assuming they were lawfully obtained) when he goes to trial ... IF he goes to trial. If the DA decides not to prosecute, the DA or the court can have the police release any non-contraband property to the owner.
If you want to sue for some sort of violation of YOUR rights, then you need to consult an attorney to see if you even have a case.
- Carl