View Blog Fingerprints have been studied for uniqueness, identification and criminal importance for more than one hundred years.
Preparation of sample evidence One group of four students will prepare "evidence" for another group to be analyzed and identified. This evidence will consist of three right thumb prints on various surfaces.
Each group member will be responsible for preparing one set of three prints. Once prepared, each member, should place their set of three pieces of evidence into a separate small baggy. The four separate sets should then be placed into an evidence box for exchanging with another group at a later time.
Materials Needed per individual: One piece of dark colored ceramic tile, one microscope slide, and a table knife. Preparation of "Exhibit A. Carefully handle it only by the edge. If it is not clean or print free, wash and rinse it with distilled water.
Wipe it dry, making sure that no unwanted fingerprints appear on the glass surface. Hold the slide in a paper towel or cloth and place a distinct RIGHT thumb print on the surface of the slide.
If the print is smudged, not clear, or barely visible, wipe off the slide and try it again. In order to take a good print, place the side of the thumb on the slide and slowly, but with slight pressure, roll it across the slide once.
Do not roll it back and forth since the print will smudge. To check if the print is usable, hold the slide up to your mouth and exhale across it. The moisture from your breath will momentarily show the existence of the print. If the print did not take, attempt again with a cleaned slide.
This time, rub your thumb over an oily portion of your face or hair. Blot your thumb so that the excess oil will not smudge the print, and then place a good print on the slide as described before.
Use a grease pencil to label the slide as "Exhibit A. Preparation of "Exhibit B" Obtain a piece of dark ceramic tile. Wash it as previously described above. Use a grease pencil to label the tile as "Exhibit B. Preparation of "Exhibit C. Wash it as previously described.
Use a grease pencil to label the knife as "Exhibit C. Preparation of "Exhibit D. Wash it as above. Select one member and, by the same procedure, have them place a RIGHT thumb print on the open bowl part of the spoon. Use a grease pencil to label the spoon as "Exhibit D. Exhibit D also should be placed into a separate baggy by itself.
All five baggies of evidence should be placed into an evidence box for later distribution. Modus Operandi MO sheets for each member, ink pad, cleanser. Fone, Polly Merz, etc. One person from the group will act as the "officer on duty" and will take the fingerprints of each member using the ink pad.
Both right and left hands are taken 10 prints. Lightly inking the fingertips and carefully rolling them one at a time, neatly and without smudging, onto the proper finger locations on the MO sheet is an important task.
A good print to compare with is a necessity in fingerprint identification. When they dry, place the MO sheets from all members of the group into the box containing the "evidence" prepared in Part I.
Analysis of the "evidence" Each group should exchange their box of "evidence" and their MO sheets with another group. Working within their own group, the students will analyze the fingerprints and determine the identity of the person who made them.
For the three separate pieces of evidence, students should place the lifted prints on a "3 x 5" index card and determine whose prints they were by using the included MO sheets.Published Fingerprints, the first comprehensive book on the nature of fingerprints and their use in solving crime.
Karl Landsteiner first discovered human blood groups and was awarded the Nobel Prize for his work in About Fingerprints –Their Nature and the History and Development of their Use It is important to understand something about the nature of fingerprints, and the properties that contribute to making them individual.
We also look at how the use of fingerprints became so . Search Essay Examples > Get Expert Essay Editing Help > Build Your Thesis Statement > Log in.
Search Nature of Fingerprints and Their Importance in Solving Crimes. words. 1 page. An Analysis of Law Enforcement Searching Methods in a Crime Scene. words. Fingerprints are one of the most important things that link a suspect with a crime scene. Even though that fingerprints are not always left by a criminal, the crime scene should still be examined for them.
Their mother, Francesca Rojas, claimed that their neighbor, a man named Pedro Ramón Velásquez had committed the crime, as she rejected his sexual advance earlier in the day and then later saw him running out of the door of the house right before she “discovered” the bodies. Back in their laboratory, the team uses an analytical technique called mass spectroscopy to find traces of substances, no matter how small, on or within the ridges of the print.