How does victim precipitation data contribute to the knowledge of interpersonal crimes, particularly homicide data?

How does victim precipitation data contribute to the knowledge of interpersonal crimes, particularly homicide data? 
How can arson dogs help law enforcement?
Which crime causation theory best explains organized crime, in your opinion? How does the presence of large, organized criminal enterprises affect law enforcement investigative efforts?
Would the association between drugs and crime disappear if drugs were legalized or decriminalized? Should certain drugs be decriminalized? If yes, which ones? Why