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An Inky Lead™ Questioned Documents Analysis

During the investigation of the Mondelo murder, police have turned their suspicion on business partner John Wayne Gretsky, finding questionable receipts on his desk. Your students must determine if these receipts are legitimate business documents or evidence of a crime. To do this, students must determine objective criteria for hand writing analysis, and then apply these criteria when examining suspect receipts.
Description

During the investigation of the Mondelo murder, police have turned their suspicion on business partner John Wayne Gretsky, finding questionable receipts on his desk. Your students must determine if these receipts are legitimate business documents or evidence of a crime. To do this, students must determine objective criteria for hand writing analysis, and then apply these criteria when examining suspect receipts.

After analyzing the handwriting, students will dissolve the ink from numbers on the suspect invoices. Then, using thin layer chromatography, they will create an ink profile for each of the samples taken from the reciept. From this information, students will determine if the same ink was used to fill out the entire form. Finally, by combining where different inks were used with what reciepts are suspected of forgery, students can develop a complete theory of the suspected forgery.

As in all Lyle and Louise modules, this kit is geared to high school and undergraduate courses, and is matched to National Science Education Standards. This kit is designed for 6 labs groups (up to 30 students).

Next Generation Science Standards

  • MS-ETS1-3. Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each that can be combined into a new solution to better meet the criteria for success.
  • HS-ETS1-2. Design a solution to a complex real-world problem by breaking it down into smaller, more manageable problems that can be solved through engineering.

Common Core Standards

  • CCSS.Math.Content.7.RP.A.1 Compute unit rates associated with ratios of fractions, including ratios of lengths, areas and other quantities measured in like or different units.
  • CCSS.Math.Content.7.RP.A.2 Recognize and represent proportional relationships between quantities.
  • CCSS.Math.Content.HSN-Q.A.3 Choose a level of accuracy appropriate to limitations on measurement when reporting quantities.

Additional Resources

Included Materials
Required Materials
  • Scissors
  • Glass Microscope Slides (12)
  • Forceps (6 - 12)
  • Lab gloves
Storage Conditions Cool and Dark (Ambient)
Stability Indefinite

Teacher Manuals

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