Luminol reagent is the most commonly used blood identification tool in crime scene investigations.
The proteins contained in blood cannot be washed away with ordinary water.
Moreover, the large amount of iron ions contained within cannot be removed just by simple washing. Luminol reagent can restore bloodstains into fluorescent traces through chemical reactions.
Of course, luminol reagent reacts to all blood and does not identify human blood specifically just by its test.
Therefore, after confirming the presence of blood, the type of blood will still be determined in blood identification.
Even in this kind of scene, it is highly likely that these are human blood traces, as nobody slaughtering chickens or fish would cause such a phenomenon.
Yet after returning to the crime scene investigation lab, Lu Chuan and the others still need to determine and analyze the type of blood.
But judging from the current situation at the scene, it can be determined as human blood.
