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.
This partnership requires that officers display not only strong technical capabilities but interpersonal skills. Therefore, law enforcement agencies must train their officers on how to interact effectively with the public. Together, technical and interpersonal skills form the basis of all police work. Any well-established law enforcement agency trains and evaluates all recruits for their technical (e.g., tactical and legal) abilities. For example, in firearms training, recruits must earn a certain score to carry a weapon.