Use a bump key when you lock yourself out of your own home, or when you need to gain access to a friend's home during a crisis. Lock bumping ordinarily leaves no signs of damage or tampering. When you bump a lock, the energy from the strike moves through the key to the bottom pins.
This is classic criminology, tracing its origins to Cesare Beccaria and working to the most modern theories of individual and group behavior. When the word is mentioned in a law enforcement agency, another image appears. Practical criminology focuses on the common actions of lawbreakers. Police officers are not as concerned with theories of criminality as they are with the practical aspects of criminal behavior.
Responsibilities. Criminalists work with law-enforcement agencies on criminal cases and spend much of their time managing physical evidence. They may, for example, find and collect evidence at a crime scene, take it back to a lab and then analyze and interpret it using scientific techniques and practical experience.