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.

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?

AnnouncementsExit Ticket trackers- absentExtra CreditQuiz 4 make upsNotebook Checks todayQuiz on TuesdayGloves on Friday and Monday

ReviewFingerprintBertillonage SystemBasal LayerLoopWhorlArch

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

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

CFU….T/F: your left index and right index fingerprints

are the same

Ridge classification (yesterdays activity)

Minutiae- description of fingerprintsCoreShort RidgeEnding ridgeDeltaHookCrossoverBridgeBifurcationIsland (dot)EnclosureEye

CFU….Minutia is the word used to describe what?

12 Point MatchCriminal Courts will generally accept 8-12

point match

12 point system Your finger printsSome one else finger prints

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?