Blood Evidence Collection and Analysis
Blood evidence is absolutely crucial in criminal investigations, but it's also incredibly fragile and time-sensitive. Crime scene investigators have just 48 hours to get samples to the lab before they become useless - talk about working under pressure!
The collection process depends entirely on whether the blood is wet or dried. For wet blood, CSIs soak it up with gauze pads or collect entire clothing items if possible. Dried blood gets scraped into paper packets using clean, sharp tools. Everything gets photographed first, naturally.
Once collected, each sample goes into separate evidence bags to prevent contamination, then straight into refrigerated storage. DNA profiling and blood group analysis can reveal the suspect's sex, species, and blood type - pretty impressive for a few drops of blood.
Key Point: The Yorkshire Ripper case hinged on bloodstains found in Peter Sutcliffe's car that matched multiple victims - showing just how powerful blood evidence can be.
