Handwriting analysis

Students match handwriting samples of suspects to a note found at the crime scene using graphology. Introduces concepts of handwriting analysis, attention to detail, and sample comparison. Students also match pens to a note found at the crime scene using paper chromatography analysis. Introduces concepts of chromatography, color composition, and scientific assays. In the last part, students take their own fingerprints and use magnifiers to identify specific characteristics. Students then apply the same techniques to evidence from the crime scene. Introduces microscopy, cell biology, chemical vs. physical changes, and data collection. This demo is aimed at grades 5-12 science, chemistry, or social studies classrooms.

Handwriting_Ink_Fiber.doc

Stomach content analysis

Students compare testimony collected from suspects to stomach contents obtained from the crime scene. Students perform control experiments and then apply the same techniques to evidence. Introduces concepts of precipitation reactions, enzymes, properties of proteins and carbohydrates (mono/di/polysaccharides), foods that contain each, and scientific assays. Introduces chemical reactions, biochemistry, positive and negative control groups, and data collection. This demo is aimed at grades 5-12 science, chemistry, biology, or social studies classrooms.

Stomach_contents.doc

Shoe print analysis

Students work in groups to compare shoes collected from suspects to shoe prints left at the crime scene. Washable paint is used to make prints of the suspects' shoes. Our discussion introduces basic concepts of statistical reasoning, by asking the students how likely a random person would have the same shoeprint as the crime scene. This demo is aimed at K-6 science or social studies classrooms.