Blood

[JonBonJovi]

How come can forensics always trace blood no matter how you clean it up?

[meglet]

You're probably better off posting this question in Science.

[RATTER15]

Because you will never get it clean enough so that it can not be detected by microscopes etc, have you tried getting blood out of a carpet, you may get it looking clean but their is probably still a lot of blood staining at the bottom of the carpet pile, it is this type of thing that gets killers caught, very difficult to remove all traces from absorbent surfaces etc.

[dantheman123]

There are different compounds that forensic scientists can get to attach to very small amounts of blood cells. I think they then detect the easier to detect compounds.

[Catso]

You sound very bitter about this.

[RATTER15]

jonbonjovi, when you do whatever you are about to do, just make sure you do it in a clinical environment, so much easier to remove all traces, or is it to late??

Oh well!!

[pingping]

i think you're probably overly influenced by csi programmes!

[JonBonJovi]

The reason I am asking is I just want to know what it is about bloud that makes it detectable so easily even when to the naked eye a wall etc looks so clean.
I know they use special chemicals etc.

[Mr.Nose]

i luv CSI. u cant evn gt th blood of a bath nd u would think tht wuld b quite easy seing as its so smooth

[Stu Dent]

'Blood' is easily detectible and can be found in certain items long after it was deposited there. However, depending on the conditions of where the evidence has been deposited, it's value to forensic scientists (or the police), diminishes greatly, very quickly. So, the forensic scientist will be able to identify that a particular stain may be blood, or sweat, or saliva, or spermatoza; but whose it is and when it was deposited onto the suspect sample, may be impossible to tell after a relatively short time.

Locard's Principle is that 'every contact leaves a trace'. But blood can be cleaned up. It may be difficult depending on the surface it's come into contact with. Smooth, shiny, plastic surfaces will be easy to clean, whilst a fabric such as cotton will be very difficult to get rid of. But as stated, you may be able to determine what it is, but whose it is, is another problem.