Evidence Collection and Presumptive Tests for Biological Fluids

These flashcards cover key concepts related to evidence collection and presumptive tests for biological fluids as discussed in the lecture.

Cross-Contamination

Occurs when biological or trace evidence from one item comes in contact with another, destroying the integrity of the evidence.

Evidence Packaging

Process of preparing evidence for storage by ensuring it is dry and packaged in appropriate materials, typically using paper for biological samples.

Chain of Custody

The process that establishes who had custody of the evidence, date and time received, evidence location, and tests conducted.

Presumptive Blood Test

A test that indicates the potential presence of blood but does not confirm it. It can react with animal blood as well as human blood.

Biological Evidence

Types of forensic evidence that include blood, semen, saliva, hair, and other biological samples typically found at crime scenes.

Hemic Structure of Erythrocytes

Erythrocytes are biconcave discs about 7.5 μm in diameter, lacking organelles, and primarily serve the function of gas transport.

Erythrocytes Function

Dedicated to respiratory gas transport via Hemoglobin, composed of globin protein and heme red pigment.

Use of Alternate Light Source

A method utilized to enhance the visibility of certain types of evidence, such as biological materials, especially in dark environments.

Pharmacist's Fold

A specific method of packaging small trace evidence such as fibers or paint chips, designed to prevent loss of material.

Acid Phosphatase Test

A presumptive test for semen that detects the presence of acid phosphatase enzyme, often used in sexual assault investigations.