Forensic Biology: Chapter 1 - Crime Scene Investigation of Biological Evidence

Who is responsible for protecting the crime scene?

first responding officer

corpus delecti

proof that a crime was committed

High-priority evidence shows

• proof a crime has occurred

• linkage

ALS

alternate light source

function of ALS

blood, semen, and saliva emit fluorescent light under an ALS

field tests for blood (4)

phenolphthalein, leucomalachite, luminol, fluorescein

Methods of collecting dry fluids

swabbing, cutting, scraping, lifting, collecting entire item

Methods of collecting wet fluids

swabbing, FTA paper

When can evidence be packaged together?

if it was found together

why is folding risky?

can transfer evidence from one part to another

never place bloodstained evidence in:

plastic bags or containers that trap moisture

how to preserve trace evidence?

druggist’s fold

how to preserve GSR?

paper bag

1

Crime scene information

2

Question formulation

3

Information collection

4

Hypothesis construction

5

Prediction making

6

Reconstruction testing

7

Data analysis and drawing conclusions

8

Theory developing and case solving