Can the state remove statements & 911 calls from a case ?

Witness made statement against my son.along with 5-911calls sayn ,he the gunman is here !!!! The witnesses son directed police to a gun.3 of my children & myself were taken to the station.Thereafter afraid for my children I said the gun was mine in an agreement to have charges dropped against my children . The state removed all the critical evidence all except the statement I had given. No gun powder test was taken .can my attorney file a motion to suppress evidence & squash arrest.