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Objectives: Students will be able to describe, compare, and identify the different types of fingerprints.
DO NOWUpdate your Exit Ticket Tracker
1.How and when are friction ridges formed?
2.What is the Bertillonage system?
3.Describe a loop, a whorl, and an arch.
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Exit Ticket1. Raised portions on your hands that allow for
gripping:a. Fingerprint b. Whorls c. Friction
Ridges
2. Define basal layer.
3. If 65% of fingerprints have loops, how are fingerprints considered individual evidence?
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AnnouncementsExit Ticket trackers- absentExtra CreditQuiz 4 make upsNotebook Checks todayQuiz on TuesdayGloves on Friday and Monday
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ReviewFingerprintBertillonage SystemBasal LayerLoopWhorlArch
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Galton SystemTurn/ Talk: why would the Bertillonage
sytem fail
Showed how to classify fingerprints using loops, whorls, and archesFingerprints stay the same from birth to deathNo two fingerprints are identicalPrints cannot be alteredPossible to classify
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Ten card system
L. Thumb L. Index L. Middle L. Ring L. Little
R. Thumb R. Index R. Middle R. Ring R. Little
L. Index L. Index
L. Index L. Index
Mine
Classmates
Rules:PartnersLight PressureNail edge to nail edge
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CFU….T/F: your left index and right index fingerprints
are the same
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Ridge classification (yesterdays activity)
Minutiae- description of fingerprintsCoreShort RidgeEnding ridgeDeltaHookCrossoverBridgeBifurcationIsland (dot)EnclosureEye
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CFU….Minutia is the word used to describe what?
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12 Point MatchCriminal Courts will generally accept 8-12
point match
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12 point system Your finger printsSome one else finger prints
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Exit Ticket1. Criminal court will accept a _____ point
match for fingerprinta. 1 b. 12 c. zero, no two
fingerprint matches are the same.
2. To individualize fingerprints, you must use the structure of ridges called _______
3. What is the difference between fingerprint patterns and ridge characteristics?