What is forensic locksmithing?
Forensic locksmithing is the practice of examining a lock to determine if a surreptitious entry has occurred. In order to perform forensics on a lock, a person must understand how a lock works. The first section of this document explains how locks are put together and work and how to pick them. The second section outlines the practice of forensic locksmithing. How does a lock work? I am going to discuss the most common type of lock for doors, padlocks, filing cabinets and office furniture: the pin and tumbler lock (See Figure 1). The pin and tumbler lock generally has five or six pins. The pins can be clearly observed in the locked part of Figure 1. The tumbler is the cylindrical “tube” that runs from the front to the backof the lock and the pins hang down intoit. As seen in the UNLOCKED part of Figure 1, the key is inserted into the tumbler and pushes the pins above it. This allows the tumbler to move and in turn the lock will open. For most locks these pins are rounded. There are hig
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