Prep for the Stations
1. Crime Scene Analysis Station
Set-up: Make crime scene mat and set up crime scene. Use a 100 cm by 100 cm piece of paper. The idea is to use a scale of 10 to 1. It is easier for the students to shrink down. Lay out the evidence as shown in the diagram. I use my crime scene mat and vandalism poster year after year. I actually glued crime scene tape along the outer edge so students do not cross over into the crime scene.
2. Machine Written Documents Station
Equipment: Font examples and a portion of note [handout, photocopy several] magnifying glasses
Set-up: photocopied type and note
3. Hair Analysis Station
Equipment: 4 microscopes, human hair sample, cat hair, dog hair
Set-up: Make four slides, 2 with the same human hair, one with cat hair, one with dog hair
Use masking tape to label microscopes: Crime scene, Sample A, Sample B, Sample C. Set up microscopes and bring slides into focus. If you want to trick the students use an animal hair as the crime scene hair. I do this frequently. I leave a dog hair at the crime scene. The suspect does own a dog.
4. Dental Forensics Station
Equipment: 4 samples of bite marks and crime scene bite marks, magnifying glasses
Set-up: Use carbon paper and white paper. Fold white paper with carbon paper inside and have four students bite down on them. Have one student do it twice so you have the crime scene bite marks. Label the bite marks, sample A, B, C, and crime scene.
A second idea here is to get a set of casts from the orthodontist. I got three different casts of teeth and the plastic imprints they make to design the casts. I put out on cast of the teeth and three different plastic molds and the students have to determine which mold fits the cast. It is harder than it looks!
5. Fingerprint Classification Station
Equipment: tape, pencils, paper, fingerprint classification chart, magnifying glasses
Make a set of crime scene prints to use at the station. To match the suspect list make sure left index finger is an arch and left baby finger is a whorl.
Set-up: Teach students to take their prints. I have them rub pencil on paper, rub their
fingertip on the lead and lift the print by placing tape over their fingertip and placing
into the correct spot in their booklet.
Crime Scene Prints
Thumb – loop; Index – Arch; Middle-Arch; Ring – Loop; Little- Whorl
6. Footprint Analysis Station
Equipment: 3 prints of runners, one cast of one runner [must match one of three prints]
Set-up: Use three runners, all same side [i.e. right or left] and make a print. I used black paint.
Use plaster of paris [costs about $3.00] and make a cast of one runner. This will be
the crime scene footprint. Make sure you use the same runner for the prints on the
crime scene mat. Choose random prints from another 2 pairs for comparison. You want one cast, and three prints and one of the prints to match the cast.
7. Fiber Analysis Station
Equipment: polyester material, [you only need a small amount] microscope, candle, tongs
Set-up: Cut polyester into small strips, about 5 cm. long and 1 cm. thick. Place candle into glass dish.
Of course you can use the other materials in the chart as well. I often use cotton. I go to the fabric store and buy the ends for about fifty cents and I am good to go. I change up the fabric year to year.
8. Chromatography Station
Equipment: 3 different black ink pens, all water soluble, filter paper [coffee filters work great] I use an overhead pen, a two different water soluble markers. Each will produce a unique chromatograph. Make sure the dot does not get submerged in water. You want the water to bleed up the coffee filter and slowly separate the ink.
jar, stick, single hole punch
Set-up: Label pens A, B. C. Choose one to be crime scene pen. Make a chromatograph to display at the station. The students make chromatographs with pen A, B, C and try to match it. Again harder than it looks!
9. Mystery Powders Station
Equipment: hot plate, vinegar, iodine, water, magnifying glass, salt, sugar, starch, plaster, baking soda
Set-up: Choose the mystery powder and label ‘?’. Place the powders in petri dishes and label. Put the solutions in small bottles and label. I use tin foil on the hot plate so it is easy to clean up. I keep old pot holders at this station so students do not touch the hot tin foil.
10. Lip Prints Station
Equipment: Magnifying glass, lip print samples
Set-up: 3 lip prints and a crime scene lip print-I use the same lipstick [Avon samples are readily available] and do the prints on filter paper Make sure someone does their lip prints twice as this will be the crime scene prints. Also the older people are, the more interesting their lip lines. I actually use mine for the crime scene!
January 28, 2013