Ask a librarian, People & professions, Such was life, Victorian history:

The early 1900s was an exciting time to be a detective. Innovations in science and technology, combined with the popularity of detective stories shifted crime fighting away from the seedy world of informers, which had influenced the early years of policing, towards the detection of crime using scientific methods and forensic evidence. Find out about how one Victorian detective contributed to the development of police forensics.