Forensics later established the victims were shot by a .32-caliber pistol and a 12-gauge shotgun, although the weapons themselves have never been found. There was no forensic evidence linking Carter or Artis to the murders; while gun residue tests were commonly used, DeSimone, the lead detective, later claimed he had no time to bring in an expert. He did arrange for an expert to conduct lie detector tests, which they passed; in 1976, a second report was discovered, claiming they failed. After 17 hours of interrogation, they were released. Carter and Artis voluntarily appeared before a grand jury, which found there was no case to answer.