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Tool Marks

Page history last edited by Tyler Kurth 6 years, 5 months ago

Tool Marks


"Man is a tool-using animal. Without tools he is nothing, with tools he is all."
-Thomas Carlyle

  • Section 1a. Vocabulary:
Tool Marks  Individual Characteristics  Hex External Drive  Impression  Abrasion 
Improvised Weapon  External Drive  Slotted Drive  Sharp Weapon  Gouges 
Class Characteristics  Square External Drive  Philips Drive  Blunt Weapon  Cut 
Surface  Casting  Mold Box      



  • Section 1b. Mastery Objectives and Critical Skills
      • Identify different kinds of Tools/Objects and their uses- Attention to Details
      • Identify what kind of impressions certain objects leave on a particular surface
      • Creating an impression/cast 
      • Create a dichotomous key- Organizing and developing your database
      • Compare and Contrast your database to the evidence given from a crime scene




  • Section 2a. Required Readings covered on Tests and Quizzes: 
  • Section 3 – Anticipated In Class ActivitiesWhat are you going to Do in this Unit?  How is the student going to pend their time?  This should include such activities as lectures/labs, videos, class projects, speakers, etc.

In this unit, we are going to make and examine different kinds of tools and the marks they make. 

Forensic Sciene: An Introduction- teacher edition 600/607     

http://youtu.be/waibs2k4dms -tire tracks molds

http://youtu.be/ZD-KSGDFX_g -casting a tool mark

http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2011/crime-in-the-u.s.-2011/tables/expanded-homicide-data-table-8 - graph on weapons used in murder

http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2011/crime-in-the-u.s.-2011/tables/robbery-table-3 - graph on weapons used in robbery

http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2011/crime-in-the-u.s.-2011/tables/table-21 - weapons used in robbery



dichotomous key lab

tool mark collecting and casting lab

tool mark comparisons 


  • Section 4 – Outside Class Assignments: Here is where you give students the opportunity to practice using those mastery objectives and critical skills as well as the related vocabulary.  This section should also include questions from the assigned readings and projects.

1) CONCEPT MAP: Create a concept map using the follow terms

     a) tool marks, improvised weapon, class characteristics, individual characteristics, sharp weapon, blunt weapon, abrasion, gouge, cut, impression

     b) tool mark, surface, casting, mold box, impression, external drive, hex external drive, square external drive, philips drive, slotted drive


2) What is the difference between Class Characteristics and Individual Characteristics? Define each.


3) What is Tool Mark?

     a) What are Tool Marks used for in forensics? ( i.e. What is the purpose of them? Why use this method? )

     b) What can create a tool mark? Give 3 examples.


4)  -make a crime scene that uses tool marks, have them identify the tool by using pictures and the given information- (this would be like a mini version of the big lab, to ease them into it)


5) Pick a household tool ( hammer, screwdriver, knives etc.. BONUS POINTS FOR A CREATIVE TOOL) find 4-6 different types of this tool and create map, organizing these tools by the following:
     a) Shape

     b) Size ( This can be on a scale of large, medium, small OR if it gives the measurement on it put that in)

     c) Label all w/ the name/brand of said item. (ex. if you chose screwdriver; What kind of  screwdriver is it? i.e. Philips, Nut Driver etc..)

NOTE: remember to include a creative title for your organizer, and that it is neat.



  • Section 5 – Outside Class Activities and Bonus Points

  Create a Library of Tool Marks. Use 3-5 different types of tools, and different shapes and sizes of these tools and create the following:

     a) a map, organizing the tools ( see #5 for further details on how to create one of these)

     b) Create the tool marks themselves ( clay works well for this). Try to get a few different angles.

     c) Use the tools "in action" to create an impression. Think about the different ways you can uses a improvised weapon. ( *hint* oranges peels and skin a pretty similar, don't you think? )

     d) Take pictures of everything from b) and c) and compile it into a library. ( This could be like a book, or a library of large index cards. etc..)




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