Yea. He's an international spy who is capable of disguising himself as someone else. He's able mimic their voices and mannerism almost perfectly. We just call him "the Phantom".

He was disguising himself as Detective Fullbright, so that he could get close to Prosecutor Blackquill. He had incriminating evidence that could reveal his identity, so he had to find some way to retrieve it from the Prosecutor. In truth, the real Detective Fulbright had been dead one year before.