Annual report of the Police Commissioner for the City of Boston . ere fifty-seven identifications made through the viewing of the mug files (both black and whiteand colored mugs) of this department during the year 1964. There was also incorporated into the segregationsystem of the mug files a separate file of arrests by districts, which enables an officer or witness to view photos ofpersons arrested in any particular area or on any district. During the year there were 1,716 latent prints found at the scenes of crime in the city, and returned tothis unit; this is an increase of 271 over the sam
Annual report of the Police Commissioner for the City of Boston . ere fifty-seven identifications made through the viewing of the mug files (both black and whiteand colored mugs) of this department during the year 1964. There was also incorporated into the segregationsystem of the mug files a separate file of arrests by districts, which enables an officer or witness to view photos ofpersons arrested in any particular area or on any district. During the year there were 1,716 latent prints found at the scenes of crime in the city, and returned tothis unit; this is an increase of 271 over the same period in 1963. The Latent Print Unit made forty-six identificationsfrom the prints found at crime scenes. There were 718 crime scenes photographed during the year 1964. The Photographic Unit has branched into more extensive use of 16 mm. movie equipment owned by thisdepartment in the area of surveillance work and with a view of practical application of this equipment in the field oftraining films. The results of this are not complete, but are very MAKING A CONNECTION 4i Polygraph Since its installation in June of 1963 the polygraph or lie detector machine has been in the hands of a trainedoperator who attended the Reid School in Chicago. This instrument has provided the department with a scientificmethod of interrogating persons suspected of having committed a crime. This machine has made it possible toreduce the number of hours previously spent in random interrogation of suspects. It has also proven its value inthose instances wherein the machine was instrumental in determining a persons innocence. Perhaps, more cor-rectly, it should be called the truth detector. The following is a report of the activities of the Polygraph Unit from January 1, 1964, to December 31, 1964: Unit Number Under Crime Serviced Persons Arresc Sex Adults Minors Investigated Homicide 42 2 Male 41 1 Murder Hackney 2 0 Male 2 0 Larcenv Robbery I 1 Male 1 0 Larceny District Four 0 Male 0 .\
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