Page 4 - Bad Impression Bite Mark

Introduction to
Bad Impression
elcome to Bad Impression, a bite marks
analysis lab in the Mystery of Lyle and
WLouise. A brutal murder case is unfolding
in a small Appalachian town. Already the case
spans two crime scenes and five people are dead.
When John Wayne Gretzky, a business associate of
two of the victims, was brought in for questioning,
investigators noticed a bite mark upon his upper
arm. Gretzky claimed he received the mark in a bar
fight the previous night.
In this lab, students will take wax impressions
of their own teeth, examine them, and develop
characters that describe the shape of their dental
arch. Students will then compare impressions
made by their classmates against a photograph
4 THE MYSTERY OF LYLE AND LOUISE
of the bite mark on John Gretzky’s arm. After
developing quantifiable characters that describe
the impressions of their classmates, they will apply
these characters to the photograph and, using
multivariate analysis with the help of a spreadsheet
program, students will determine if any of the
impressions are a possible match to a photograph
of the suspicious bite mark.
Once the lab results have been analyzed, students
may host a mock trial to hold a chosen suspect
accountable for their actions.
Teacher’s notes can be found at the beginning of
the manual and copies may be freely made of all
materials for your students.