Evidence Collection & Preservation Flashcards

What is the first step in evidence collection?

Answer: Secure the crime scene

The first and most critical step in evidence collection is to secure the crime scene. This action prevents unauthorized personnel from entering, minimizes contamination, and ensures that potential evidence is not disturbed, lost, or altered before it can be properly identified and collected.

Why is proper packaging important for evidence preservation?

Answer: Prevent degradation and contamination

Proper packaging is paramount for evidence preservation as it prevents degradation and contamination of the samples. Appropriate containers protect evidence from environmental factors like moisture, temperature fluctuations, and cross-contamination from other items, thereby maintaining its integrity for accurate analysis.

What is chain of custody in evidence handling?

Answer: Documented evidence control

Chain of custody in evidence handling refers to the meticulous, documented control of evidence from the moment it is collected until it is presented in court. This unbroken record details every person who handled the evidence, when, and why, ensuring its authenticity and preventing any claims of tampering or contamination.

Which material is best for collecting biological evidence?

Answer: Cotton swabs

Cotton swabs are generally considered the best material for collecting biological evidence because they are highly absorbent, allowing for efficient collection of samples like blood, saliva, or skin cells. They can also be easily sterilized to prevent contamination and are suitable for drying to preserve DNA.

Why should evidence be stored in breathable containers?

Answer: Prevent mold and degradation

Evidence should be stored in breathable containers, such as paper bags or envelopes, to allow any residual moisture to evaporate. This crucial step prevents the growth of mold and bacteria, which can rapidly degrade biological evidence and compromise the integrity of DNA samples.

What is the purpose of labeling evidence containers?

Answer: Accurate identification and tracking

The purpose of labeling evidence containers is to ensure accurate identification and tracking throughout the entire investigative and judicial process. Clear, detailed labels provide essential information, preventing mix-ups, maintaining the chain of custody, and ensuring that each piece of evidence is correctly associated with its case.

How should evidence be transported to the lab?

Answer: Secure, contamination-free transport

Evidence must be transported to the lab in a secure, contamination-free manner to maintain its integrity. This involves using sealed, labeled containers and following strict protocols to prevent loss, damage, or cross-contamination, ensuring the evidence remains admissible and reliable for analysis.

Why is minimizing contamination important during collection?

Answer: Maintain integrity and accuracy

Minimizing contamination during evidence collection is critically important to maintain the integrity and accuracy of forensic results. Any foreign DNA introduced to a sample can lead to misleading or inconclusive findings, potentially compromising the investigation and the pursuit of justice.

What documentation is essential when collecting evidence?

Answer: Date, time, collector, description

Essential documentation when collecting evidence includes the date, time, the identity of the collector, and a detailed description of the item and its exact location. This comprehensive record is fundamental for establishing the chain of custody, proving the evidence's authenticity, and ensuring its admissibility in court.