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Increasing Inquiry with Forensics

NSTA Annual Conference March 29, 2012 Kristen Kohli. Increasing Inquiry with Forensics. Background Information. Kristen Kohli – kkohli@buhsd.org Estrella Foothills High School http://www.kohliscience.com. Why Forensics?. Junior/senior elective Broad appeal

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Increasing Inquiry with Forensics

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  1. NSTA Annual Conference March 29, 2012 Kristen Kohli Increasing Inquiry with Forensics

  2. Background Information Kristen Kohli – kkohli@buhsd.org Estrella Foothills High School http://www.kohliscience.com

  3. Why Forensics? • Junior/senior elective • Broad appeal • Gives students a chance to explore a variety of sciences: • Chemistry • Biology • Physics • Earth Science • Increase engagement & inquiry in science

  4. Initial Planning • NSTA Conferences • Textbook evaluations • State standards • Online resources • http://www.bsapp.com • http://www.theforensicteacher.com • http://www.nahstofs.org/ • Available resources

  5. Course Layout • Introductory Unit – 1 week • Common Trace Evidence (hair, fibers, pollen, spores, sand, soil) – 3 weeks • Fingerprints, DNA, & Blood – 3 weeks • Lessons from the Body (death, forensic entomology, forensic anthropology)- 2 ½ weeks • At the Scene (glass, impressions, accident reconstruction) – 2 ½ weeks • Weapons & Tools – 2 weeks • Summative Crime Scene Project – 1 week

  6. Introductory Unit • Case studies & careers in all units • Room burst • Awareness test • The Art of Crime Detection (http://tinyurl.com/3ub9o8w )

  7. Trace Evidence Unit • Collecting materials • Hair • Pollen/spores • Sand/Soil • Introductory inquiry activities • ID differences • Unknown samples • Direct instruction • Application • How to photograph • Polymer worm demo • Burn lab • Soil/sand lab

  8. Fingerprints, DNA, & Blood • Iodine demo • 10 cards • Dust & match • Virtual labs at learn.genetics.edu • Gel electrophoresis • Blood typing • Spatter patterns & trigonometry

  9. Lessons from the Body • Determining driver using autopsy • Dermestid beetles • Visible Proofs activities: http://www.nlm.nih.gov/visibleproofs/ • Stomach content lab • PBS Crime Scene Creatures website & Body Farm • Forensic anthropology & facial reconstruction webquest

  10. At the Scene • Obtaining glass samples • Glass density lab • Water bead demo • Becke lines & submersion tests • Youtube clips on breaking glass • Casting shoe prints & comparing • Do-it yourself drag sled • Crash reconstruction at Edheads.org • Styrofoam plate bite comparisons

  11. Weapons & Tools • Tool marks & Play-Doh • Mikrosil casts • Turkey bone marks • Collecting cartridge casings • Firearmsid.com • Trajectory & trigonometry – Kennedy clip

  12. Summative Project – Final Crime Scene • Day One: • Project introduced • Groups of four • Ten minutes to determine roles for scene

  13. Summative Project – Final Crime Scene • Day Two: Visit the scene • Ten minutes per group • Armed with digital camera • Supplies available at scene: • Measurement tools: calipers, meter sticks, metric wheels • Evidence bags, labels, numbers, bindle paper, & tape • Trajectory rods, protractors, & string • Forceps, gloves, tape • Order tests, samples, info

  14. Summative Project – Final Crime Scene • Evidence at the Scene: Blood/Impressions/Soil

  15. Summative Project – Final Crime Scene • Evidence at the Scene: Hair • Victim • Girlfriend (perpetrator) • Guinea pig

  16. Summative Project – Final Crime Scene • Evidence at the Scene: Glass & Fingerprint

  17. Summative Project – Final Crime Scene • Evidence at the Scene: Bullet casing & fingerprint

  18. Summative Project – Final Crime Scene • Evidence at the Scene: Acetate cloth with lily pollen

  19. Summative Project – Final Crime Scene • Evidence at the Scene: Bullet hole

  20. Summative Project – Final Crime Scene • Day Three: Science lab • Femur & pelvis evidence • Test results • Self-directed • Supplies: light microscopes, dissecting microscopes, rulers, dusting powder and brushes, liquids with refractive indices of 1.33 and 1.47, slides, coverslips, tape, candles, forceps, magnifying glasses, watch glasses, test tubes, clear nail polish, hydrochloric acid, acetone, magnets, barium chloride, acetic acid, UV light, petri dishes, and mortar and pestles sets • Additional test/info requests

  21. Summative Project – Final Crime Scene • Day Four: Computer lab • Final lab request results • Time to prepare Power Points • Assessment: • Chain of custody • Sketch of scene • Careful crime scene teamwork • Safe lab work & knowledge of testing procedures • Evidence collection , testing, & correct analysis • Presentation of findings

  22. Ask For Help • Guest speakers • FBI • SRO • Parents • Grants

  23. Contact Information Kristen Kohli kkohli@buhsd.org http://www.kohliscience.com

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