 The surviving police files on the Whitechapel murders allow a detailed view of investigative procedure in the Victorian era . A large team of policemen conducted house @-@ to @-@ house inquiries throughout Whitechapel . Forensic material was collected and examined . Suspects were identified , traced , and either examined more closely or eliminated from the inquiry . Police work follows the same pattern today . More than 2 @,@ 000 people were interviewed , " upwards of 300 " people were investigated , and 80 people were detained . 
