History

• Crime detection and investigation used to depend mostly on witnesses, hearsay or forced confessions. The first modern crime detection organization was Scotland Yard, established in the 19th century.
  
  

Process

• Crime detection begins with the discovery of a crime scene, and proceeds through the process of evidence collection, identification and analysis.
  
  

Crime Scene

• Crime scene investigation employs many forensic techniques, examining hairs or fibers, firearms, anatomy, bodily fluids and chemistry.
  
  

Surveillance

• Surveillance is used when there is a high probability of a crime taking place at a specific place and time. Detectives are bound by all privacy laws, and must obtain a court order to intrude on privacy.
  
  

Interrogation

• Interrogation is probably the oldest crime detection and investigation technique. Detectives interview all known victims or witnesses and interrogate suspects to further their investigation.