NC Science Olympiad
2017 Forensics
Division: C - High School
NC Essential Standard Alignment: Chm.3.1, Chm.3.2, Science as Inquiry
Official Event Rules: See National Rules Manual
National Event Page: Forensics
Required Materials: Splash goggles, lab coat or chemical apron with long sleeve shirt, covered legs, closed toed shoes, long hair tied back, and something to write with. Competitors should also bring the optional materials listed below, or they will be at an extreme disadvantage.
Clarifications:

NC Only: 2.b.ii,iii. Supervisor will provide 1M HCl and 1M NaOH. (9/9/16)

NC Only: 3. NC REGIONALS will only be focusing on parts 3.a.(powders), 3.b.ii.&iii (hair & fibers), 3.c. chromatography, and 3.d.i.& i.v.(fingerprints & entomology) Other topics listed in the rules MAY be covered at the state tournament. Additional questions may be asked on general lab safety and procedure. (9/12/16)

Description: This is a Lab based event. Teams will be given a crime scenario which they will be asked to solve based on evidence they gather and test. The evidence topic for 2017 in NC is powders, hair & fibers, chromatography, entomology, & fingerprinting. Teams will then be asked to analyze the information they have gathered to identify a suspect and solve the crime.

Materials: Teams MUST bring chemical splash goggles, safety gear, and a writing instrument. Teams may also bring spot plates, test tubes and test tube holders or any containers in which they can perform the tests, popsicle sticks, spatulas, plastic spoons, tongs, etc. for handling materials, pH paper, a ruler, conductivity tester, thermometer, hand lenses or loupes, paper towels, a disposable cup for solid waste, writing instruments, 2 non-camera calculators, and 5 pages, both sides containing information in any form from any source. Sheet protectors are encouraged.

***SAFETY ISSUE*** In addition to OSHA approved chemical splash goggles with indirect vents, teams also MUST wear closed toed shoes, pants/skirts that cover legs to the ankle, AND a lab coat/apron that reaches below the knee or they will not be allowed to participate. Long hair must be tied back. In addition, any teams seen handling materials in an unsafe manner will be disqualified from the event. ***SAFETY ISSUE***

Event Leaders will provide a proper lab environment, all evidence to be collected, additional equipment necessary to perform tests on the evidence, the official test and answer sheet.

Scoring: High score wins. Points are earned for proper identification of evidence as well as analysis of the crime.

Common Mistakes:

  • - Be sure to follow all safety requirements! Safety issues will NOT be arbitrated.
  • - Event leaders will not answer questions on testing procedures (for example- how to perform a burn test on fibers) nor will they provide a copy of the rules or a list of the possible unknowns. Teams should already know procedure, and should include a list of the possible unknowns in their allowed notes if they cannot remember. Event leaders WILL answer safety questions, and stop students from performing a test in an unsafe manner.

Available to purchase from the NCSO store:

Full Event Practice Test Kit - Complete Kit containing an entire test, response sheet, answer key, evidence samples, and tool kit exactly as it would be given to the competitors in the event. 2017 kit covers powders, hair & fibers, chromatography & fingerprinting. This kit cannot be shipped due to the liquids and chemicals it contains, and must be picked up within NC.

Chromatography Kit

Fiber and Polymer Kits - A complete kit containing the following fibers: Cotton, Polyester, Nylon, Wool, Spandex, Silk, Linen and the following polymers: PETE, HDPE, PVC, LDPE, PP, PS, PMMA, and PC. Each kit contains enough of each material to perform several tests. It includes a sample of all 7 fibers and all 8 polymers that are typically used in the CrimeBuster or Forensics event.  The kit comes with basic instructions as well. 

Event Resources:
2015 Coaches Institute Presentation (2016 Rules)
Powder ID cards from workshop
Powder chart to fill in characteristics(editable)
Sample Power ID Flow Chart for Crimebusters



Forensics/Crime Busters Websites

General sites on Forensics and Crime Busters
Forensic checklist of links, activities, and notes
http://php.indiana.edu/~lwoz/socrime/index.htm
or http://www.soinc.org/events/scicrime/notes/index.htm
Zeno’s Forensic site with links to real world stuff
Forensic Science Course Outline
Scienceman’s notes on Forensics
Real World—Articles on aspects of crime scene data collection
The Thin Blue Line. Descriptions of Blood, Bugs, DNA, and Ballistics
Forensics in the Classroom—activites!
Links to forensic activities for students
SO Sample exams for Forensics and other events
Polymers and Fibers:
American Chemistry—Teaching Plastics:
Plastics Info—video clips of how to determine densities of polymers
Polymer density lab
Microscopic Images of Fibers—search for the types of fibers and select the kind of microscopic technique for the image you want.
Hair analysis—FBI
Animal Hair Images
Fiber analysis—FBI
Sample fiber identification flow chart

Chromatography:
Intro to Chromatography
How To Do Paper Chromatography with students
How to calculate the Rf value for a chromatogram
Tutorial on Interpreting Mass Spectra
http://www.cem.msu.edu/~reusch/VirtualText/Spectrpy/MassSpec/masspec1.htm
Basic info Mass spectroscopy

Blood Information:
Blood Typing Game—very cool!
Blood Spatter info
More blood spatter info
Electropherogram info
Rf values help

Shoe and Tire Prints
Intro to Footprints and Tiremarks
Techniques for collecting evidence of shoe and tire prints
Lab activity on shoe and tire prints

Entomology
4-H activity on crime scene entomology
Sample kit of blowfly life cycle with activities


Fingerprints-general information
2014 Coaches Institute Handout (2015 rules- covers all topics, not just NC ones)
2012 Coaches Institute Presentation (powders, polymers, fingerprints, glass)
2011 Coaches Institute Presentation (2012 NC rules)
2010 Coaches Institute Presentation (2011 rules)
2007 NC Coaches Institute Presentation

Sample Events:
2014 State Test - powders, toolmarks/impressions, firearms/ballistics
2010 Regional Test- Stolen Steelers
Wright Center for Science Education Sample Events

Photo and Video:

Photo:  
Video: How to identify unknown fibers based on their flame test characteristics. Start with fibers you know and test them all, being careful to observe and record all characteristics of the test. It is much easier to make your own chart to follow than to download one, since you will recognize the same characteristic in a fiber more easily if you described it in your own words rather than trying to match it to someone else's description.
How to do a polymer density test. Follow the flow chart and see if each polymer sinks or floats in the liquid it's placed in to determine its relative density and come to an identification. If a polymer is floating, make sure it is actually floating and not sticking to the surface via surface tension. Do this by forcing the pellet to submerge, then see if it floats back up.
Performing powder tests in the Forensics event. The process here is the same as in the Crime Busters event.
More powder tests. Always write down everything!
Not in 2013 NC rules. Performing chromatography tests. Ideally you would not want the filter paper to touch the side of the cup, you would suspend it from a straw or rod of some sort.
The divide and conquer approach. One teammate works on powder identification (note the proper use of wafting to identify smells) while the other teammate works on the fingerprint IDs.


 
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