Collection of Blood

Vacutainer is a federally and internationally registered trademark owned by BD (Becton, Dickinson and Company) that is used in connection with a complete system of tubes, needles and needle holders, sharps collectors and safety devices in blood collection. The Vacutainer evacuated tube, for example, automatically aspirates the correct amount of blood into a tube. It is used instead of a syringe. Despite the fact that BD owns the Vacutainer trademark, the term has become so widely used to describe similar blood collection tubes and devices, that it has become a generically used term. Tube that allows the drawing of multiple blood samples

When blood is being collected for DNA typing, purple top is used.

Consists of folding one end of the paper over one third, then folding the other end (one third) over that and repeating the process for the other two sidesthis is used for small trace of evidence, A way of folding paper so that evidence does not fall out is referred to as a ...

Simple test that shows that a sample probably contains the substance the test aims to identify, a test which indicates a likelihood (presumes) that blood is present but doesn't establish it as fact.

Known specimens are those whose origin is known with certainty. Other names for the known specimen are: exemplar and reference. They are used to compare the blood or physiological fluids on the evidence.

A sample of suspected blood on suspects clothing that he says came from a fight with a known subject and not the victim of crime being investigated.

It refers to a specimen known to be free of the items or substances being tested.

prevent blood clot formation by inhibiting the synthesis or inactivating one or more clotting factors

Cheek swabbings or light scrapping can provide adequate quantity of cells for DNA typing. Must use sterile collecting device for buccal swabbings.

Controls are a very important part of scientific testing. They allow scientists to be sure tests are working properly. It is important to show that the results came from the evidence itself and not the substratum (underlying surface) object the sample came from.

Four different types of control and comparison specimens that might be used in forensic testing of evidence. Alibi, knowns, blank, and subtratum.

a known sample, certainty of origin.

It refers to a specimen of the surface or item that the stain was removed from. It is underlying material. Example: Concrete block that stain was removed from.