free is because they made a mistake in telling him what a waiver is. >> authorities say thomas' juvenile status at the time of the murder prevents them from discussing the case. in a statement to msnbc prosecutor robin carroll did say "a prosecutor is the only one in a criminal action who is responsible for the presentation of the truth. through our efforts in this case, we believe we have achieved that goal." >> someone killed my sister and they just dropped the case. justice has not been done. >> back in camden, thomas moves in with his grandparents. he says he rarely communicates with his mother and hopes to study astrophysics. this is the first time he's ever spoken about his interrogation. >> what the cops did was not right. i believe they were unprofessional. they thought they knew