Tool Actions
Striated or impressed marks may be produced by tools based on the types
of actions performed. Tools may leave a variety of combinations of striated
and impressed toolmarks as described in the following table.
Tool Actions |
Action |
Description |
Example |
Scraping |
A flat-bladed tool held at 90° to a surface and drawn across that surface |
Door or window frame with surface scrapes from a screwdriver
or pry bar |
Pinching |
An opposed blade cutting tool, such as a pair of bolt cutters or diagonal wire cutters |
Remains of explosive devices |
Shearing |
Shear cutters, the blades of which are offset to pass by each other in the cutting process, such as tin snips or scissors |
Cut alarm or telephone wires |
Slicing |
A single-bladed tool, such as a knife or axe |
Tires, wires, and (rarely) bone and cartilage |
Prying |
A prying tool using leverage to force open a locked door or cover at one of its edges. May be a flat-bladed prying tool, (e.g., crowbar, screwdriver, tire iron, etc.) |
Bank or store safe, or the strike plate of doors |
Gripping |
A gripping tool with opposing jaws, such as a pipe wrench, pliers, or a vise. Serrated jawed gripping tools add another dimension to the types of marks present. |
Doorknobs |
Crimping |
An opposing jawed tool designed to press material together without cutting it |
Lead seals (e.g., bank money bags, or containers for classified material) |
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