Tool Mark Impressions A key element in collecting evidence at a crime scene not only involves finding things like blood or fingerprints but also finding impressions left by tool marks. These types of marks can be created by any tool such as a crowbar, hammer, or a screwdriver. Discovering these types of marks at a crime scene are very important to the crime scene investigation process. There are three different types of tool marks, these are compression, sliding, and cutting tool marks. All of these tool marks carry different identifiable characteristics. For instance, compression tool marks are marks made by tools that are pressed into soft materials such as wood, sliding tool marks are made when a tool slides against a surface such as
