What substance should be added to blood samples collected from a ...

[captainjonesify]

What substance should be added to blood samples collected from a crime scene? Name two reasons for adding this substance to blood evidence.
 
  What will be an ideal response?

Question 2

How should packages containing biological evidence be stored until they are delivered to a laboratory? Name one common exception and describe how it should be stored.
 
  What will be an ideal response?

[macagnavarro]

Answer to Question 1

The preservative EDTA (ethylenediamine tetraacetic acid) should be added to blood samples collected from a crime scene. EDTA serves as a preservative and inhibits the activity of enzymes that degrade DNA.

Answer to Question 2

Packages containing biological evidence should be refrigerated or stored in a cool location out of direct sunlight until delivery to the laboratory. One common exception is blood mixed with soil, which must be stored in a clean glass or plastic container and immediately frozen.