One argument in favor of tape recording police interrogations is that a tape recording gives the precise words used in the interrogation, as well as inflections and tone of voice, which makes it of more assistance than a written record. Other arguments are that tape recording would deter, if not prevent, the use of unfair questioning practices by police and that tape recording would provide a means of resolving disputes about what took place during an interview. An argument against tape recording is that criminal investigations might be hampered if interrogations were tape recorded, because a suspect would avoid making admissions or implicating other persons involved in criminal activities. Another argument is that if the use of tape recorders became standard, evidence of an interrogation which was not tape recorded might be regarded as inferior and of less value, even though recording it might have been impracticable. It is also argued that the use of tape recorders might lead to 'trials within trials.' The report identifies problems to be overcome before any system of tape recording police interrogations could be introduced, including questions about the scope of any tape recording and the preparation of transcripts of what was said on the tapes. A feasible experiment for tape recording is delineated and approaches to take in evaluating such an endeavor are suggested. Appendixes present police questioning procedures, challenges to police evidence, costs of an experiment, and other related information.