• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar
  • Skip to footer
  • The Newspaper
  • Our Team
  • PDF Books
  • Archive
  • Gallery
  • Contact Us

Scena Criminis

L'Informazione al servizio della Legalità

  • EnglishEnglish
    • ItalianoItaliano
    • EnglishEnglish
    • EspañolEspañol
  • News & History
    • History of Crime
    • Criminal Words
    • Gender Violence
    • News
    • Organized Crime
  • Quotes, Interviews, Videos
    • Interviews
    • Quotes
    • Videos
  • Crime & Art
    • Recommended Books
    • Criminal Portraits
    • The Eye that Kills: Cinema and Crime
    • Violent Art
  • Criminal Biographies
    • Caserta: Crimes from the Past
    • Criminal Biographies
    • Most Wanted
    • Mysteries and Unsolved Crimes
    • Serial Killer
    • Snapshots from a Crime
  • Forensic Sciences
    • Criminalistics
      • Ballistics: Rifles and Guns
    • Criminology
      • Psychology
      • Sociology
    • Law
    • Nonverbal Communication
You are here: Home / Forensic Sciences / DNA Evidence: basics of identifying, gathering and transporting

DNA Evidence: basics of identifying, gathering and transporting

29 March 2015 da admin Leave a Comment

0Shares

Gathering DNA Evidence

Physical evidence is any tangible object that can connect an offender to a crime scene. Biological evidence, which contains DNA, is a type of physical evidence. However, biological evidence is not always visible to the naked eye. DNA testing has expanded the types of useful biological evidence. All biological evidence found at crime scenes can be subjected to DNA testing.

Identifying DNA Evidence

Remember that just because you cannot see a stain does not mean there are not enough cells for DNA typing. Further, DNA does more than just identify the source of the sample; it can place a known individual at a crime scene, in a home, or in a room where the suspect claimed not to have been. It can refute a claim of self-defense and put a weapon in the suspect’s hand. It can change a story from an alibi to one of consent. The more officers know how to use DNA, the more powerful a tool it becomes.

Crime Scene Integrity

Protection of the crime scene is essential to the protection of evidence. Safeguarding and preserving evidence is fundamental to the successful solution of a crime. Remember, while documenting evidence at the crime scene, to include descriptions of whether evidence was found wet or dry. An example of this documentation would include blood spatters.

Contamination

The risk of contamination of any crime scene can be reduced by limiting incidental activity. It is important for all law enforcement personnel at the crime scene to make a conscious effort to refrain from smoking, eating, drinking, littering or any other actions which could compromise the crime scene. Because DNA evidence is more sensitive than other types of evidence, law enforcement personnel should be especially aware of their actions at the scene to prevent inadvertent contamination of evidence.

Chain of Custody

The chain of custody of evidence is a record of individuals who have had physical possession of the evidence. Documentation is critical to maintaining the integrity of the chain of custody. Maintaining the chain of custody is vital for any type of evidence. In addition, if laboratory analysis reveals that DNA evidence was contaminated, it may be necessary to identify persons who have handled that evidence. In processing the evidence, the fewer people handling the evidence, the better. There is less chance of contamination and a shorter chain of custody for court admissibility hearings.

Transportation and Storage

The first responding officer may be called upon to transport evidence from a crime scene. As with any evidence, the officer should ensure that the chain of custody is maintained. In addition, they should be aware that direct sunlight and warmer conditions may degrade DNA, and avoid storing evidence in places that may get hot, such as the trunk of the police car. To best preserve DNA evidence, store in a cold environment. Any probative biological sample that has been stored dry or frozen, regardless of age, may be considered for DNA analysis. Nuclear DNA from blood and semen stains more than 20 years old has been analyzed successfully using polymerase chain reaction (PCR). Samples that have been stored wet for an extended period of time should be considered for testing only using PCR and may be unsuitable for DNA analysis. Mitochondrial DNA analysis has been performed on very old bones, teeth, and hair samples.

Source: nij.gov

Related posts:

Emotional Children's testimonies are judged as more Credible
Detecting trace amounts of Explosives with Light
Intermittent Explosive Disorder (IED)
Carcass of Beef - Rembrandt
0Shares

Filed Under: Criminalistics, Forensic Sciences

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Primary Sidebar

Make a donation to support our activities

Stay updated in real time

Subscribe to the Newsletter
Loading

Follow us

  • Email
  • Facebook
  • Instagram
  • Twitter
  • YouTube

Search

Safe and prudent use of Internet

Categorie Articoli

Last Articles

Info

  • Business Contacts
  • Disclaimer

Tags

America american most wanted art artist Chicago crime crimen crime scene criminal Criminalistics crimine criminology CSI disorder Dna fbi forensics forensic science homicide killer law most wanted Murder Nonverbal Communication oil on canvas painting police prison psicólogia psychology psychology today research reward scena criminis science serial killer sex sex offender terrorism terrorist united states US USA violence violent art

Footer

Privacy Policy
Cookie Policy

Scene Criminis aims to bring together – around a “round table” – experts, students and simple onlookers, who want to confront, update and find new stimuli.

The largest Italian Community on Forensic Sciences that collects news, studies, curiosities and contributions on Criminology, Criminalistics, Crime Report and Law.

Scena Criminis is also a Non-profit Association, active throughout the province of Caserta (Italy), which has 3 fundamental purposes: Defense of Legality, Fight against all forms of Violence, Education to Gender Differences.

Follow us

  • Email
  • Facebook
  • Instagram
  • Twitter
  • YouTube

Instagram

scenacriminis

#Siria #Turchia #terremoto #earthquake #Siria #Turchia #terremoto #earthquake
Buono a sapersi! 👮 💣 www.scenacriminis.com Buono a sapersi! 👮

💣 www.scenacriminis.com 💥
Instagram post 17942911742429688 Instagram post 17942911742429688
💣 www.scenacriminis.com 💥 💣 www.scenacriminis.com 💥
⚫️ www.scenacriminis.com 🟡 ⚫️ www.scenacriminis.com 🟡
😱😱😱 😱😱😱
Seguimi! 🦧 Seguimi! 🦧
Gli è andata male... 👮‍♂️ Gli è andata male... 👮‍♂️
Seguimi ➡️ scenacriminis.com 💪 Seguimi ➡️ scenacriminis.com 💪
Carica altro… Segui su Instagram

Copyright Scena Criminis Testata giornalistica registrata presso il Tribunale di Santa Maria Capua Vetere (CE) n. 849 del 26/04/2016 © 2023 ·

Direttore Responsabile: Gianfrancesco Coppo

Created by BDM | Log in