Fingerprint Analysis - West Linn-Wilsonville School District

Fingerprint Analysis - West Linn-Wilsonville School District

Fingerprint Patterns and Ridge Counts Unit Two Forensic Science Notes 2.2 Three Patterns (Classes) of Fingerprints (Eight Types)

1. Arch Patterns x2 Plain arch Tented arch 2. Whorl Patterns x4 Plain whorls Central pocket loops

Double loops *Accidentals 1. Loop Patterns x2 Radial Ulnar (called a left or right loop if the hand

from which it came is unknown) The Archs The Plain Arch Formed by ridges entering from one

side of the print and exiting on the opposite side. These ridges rise at the center, forming a wavelike structure. The Plain Arch - count

Connect the delta to the center Ridge Count = 0 (the delta is the center) The Tented Arch Similar to the arch, but there is either a

sharp spike, or the ridges meet at an angle that is less than 90 degrees. The center often resembles a tent pole.

The Tented Arch - count Connect the delta to the center Ridge Count = 0 (the delta is the center) The Loops

A loop must have one or more ridges entering from one side of the print, curving, and returning to the same side. If a loop opens

toward the little finger, it is called an ULNAR LOOP. If it opens toward the thumb, it is a RADIAL LOOP. The Loop Ridge count

Connect the delta to the center core and count the number of ridges cross the line Whorl Patterns The Double Loop (A Whorl)

The DOUBLE LOOP is made up of any two loops combined into one fingerprint The Double Loop ridge count Count the ridges that cross a line

drawn between the delta The Plain Whorl These have at least one ridge that makes a complete circuit. This ridge

may be in the form of a spiral, an oval, or any circular form. A line drawn between the delta will intersect a circle The Plain Whorl - count

Count the ridges crossing a line drawn between the delta. The Central Pocket Loop (whorl) The central pocket

loop pattern consists a whorl embedded in a loop formation. A line drawn between the deltae will not intersect a circle

The Central Pocket Loop Count the ridges that cross a line drawn between the deltae

Recently Viewed Presentations

  • Democratic Association Iskam Da Znam (I Want to Know)

    Democratic Association Iskam Da Znam (I Want to Know)

    DEMOCRATIC ASSOCIATION ISKAM DA ZNAM (I WANT TO KNOW) BULGARIA, SHUMEN . 2017. member of the Public Council of the Commission for Interaction with NGOs and Complaints of Citizens in the 44th National Assembly of the Republic of Bulgaria.
  • Stairways and Ladders - WVU Extension Service | Extension Service

    Stairways and Ladders - WVU Extension Service | Extension Service

    Metal pan stairs - metal pan landings and treads filled with concrete or other material for permanent use. During construction, "foot traffic is prohibited on stairways with pan stairs where the treads and/or landings are to be filled in with...
  • Efficient Secure Query Evaluation over Encrypted XML Databases

    Efficient Secure Query Evaluation over Encrypted XML Databases

    Efficient Secure Query Evaluation over Encrypted XML Databases Wendy Hui Wang Laks V.S. Lakshmanan University of British Columbia, Canada
  • Managerial Economics & Business Strategy

    Managerial Economics & Business Strategy

    Stackelberg Model . Bertrand Model. ... Relatively few firms, usually less than 10. Duopoly - two firms. Triopoly - three firms. The products firms offer can be either differentiated or homogeneous. Firms' decisions impact one another. ... Managerial Economics &...
  • Building an Effective Website - GCI Church Tech

    Building an Effective Website - GCI Church Tech

    Your website needs to be effective. Your website needs to be attractive. Your website needs to be easy to use. To start with… Having people visit your website does no good if your website doesn't contain accurate information about your...
  • Peer Support for Children and Young People's Mental Health ...

    Peer Support for Children and Young People's Mental Health ...

    An appreciation of CYP concerns and worries about peer support programmes within their setting. An understanding of the importance of relationships in peer support for CYP mental health. A sound understanding of the 5 core principles of a good peer...
  • ERRORS AND SIGNIFICANT FIGURES - Auburn University

    ERRORS AND SIGNIFICANT FIGURES - Auburn University

    ERRORS AND SIGNIFICANT FIGURES ERRORS Mistakes - result of carelessness, easily detected Errors - fall into two types, systematic or random ERRORS Systematic errors - due to imperfections in instruments and/or way experimenter does things Random errors - due to...
  • www.rolands.com

    www.rolands.com

    Recentsecurityapprovals. Distributed operations to othersites. Mail from NORCAX to FISB/H (National secret) Move files from NORCAX to FISB/H. Planning onusingonlyone JEMM, it will be on NS and can be used directly from NORCAX.