How are blood samples from a live victim typically collected for forensic analysis?

Blood samples from a live victim are typically collected for forensic analysis using yellow and purple stoppered vacutainers because these containers are specifically designed for blood collection and storage. The purple stoppered vacutainers contain EDTA, an anticoagulant that prevents the blood from clotting, which is essential for preserving the sample for various laboratory tests, including DNA analysis. The yellow stoppered vacutainers are often used for serum collection, which is necessary for biochemical tests.

The design of these containers also ensures that the blood is collected in a way that minimizes contamination and preserves the integrity of the sample, allowing for accurate forensic analysis. The use of specialized vacutainers is crucial in forensic practice as it adheres to protocols and standards aimed at maintaining the quality of the evidence collected from the scene.