What is the difference between a police interview and an expert testimony?

The case cited for the proposition that the procedures at issue here violated due process is readily distinguishable. In Palmer v. Peyton, 359 F.2d 199 (4th Cir. 1966), a rape victim was brought to the police station to listen to the voice of a suspect. Such a procedure is intensely suggestive for, in essence, the police are stating to the victim of a violent crime that the individual under examination was the perpetrator. Because of the aura of professionalism surrounding police officers and the victim's own desire to find the perpetrator, the victim will be under emotional pressure to concur with the judgment of the police. By contrast, the experienced expert witness who is not personally involved in the crime is less likely to be swayed by the judgment of the police. In addition, the expert is aware of his duty to prevent circumstantial evidence from affecting

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