Finding blood or body fluids at a crime is going to provide quite a bit of information to the detectives about the actions that may have happened at the scene and the people who are involved. You will find that body fluid often will provide a DNA profile that the police can use to help them out in the investigation process.
The problem is, the analysis of the body fluids is a very long and drawn out process. One of the first steps that you will find being used will be visual techniques that will be used with the eyes and the use of an alternative light source. The alternative light source tends to give light in different wavelengths which is going to allow you to find the stains and other items that may have been covered up or even wiped down. You will find that this does not allow you to tell between the body fluids, which is an issue at times. Once you have seen the indication of potential body fluids, you will want to take a sample in a controlled manner that is going to allow for a great analysis of the DNA. The problem is you will find that this is not a single method that can be used to perform the analysis on the body fluids.
Tests For Blood
You will find that one of the most common body fluids is blood. It is mainly blood cells, proteins, minerals and many other cell related products. You will find that this is one of the most obvious items you find, which means you have multiple test that have been developed to help out. There are some presumptive tests using a liquid flow meter to see if what you see as a stain is really blood or not. Luminol is one of the most commonly used items as it will cause oxidation of haemoglobin and allow it to show up as the colour blue. Another chemical that is used is Fluorescein. This causes a heme-accelerated oxidation to happen, but it does require an alternative light source to see the change. Another one is Phenolphthalein, which is sometimes called the Kastle-Meyer test. This cause the solution to turn slightly pink. LMG or Leucomalachite Green is another presumptive test that will allow you to see the blood as it will turn a shade of green. Not only that you will find that you have a lot of commercially available options that can help in detecting blood as well. While the number of tests may seem like it will cover any aspect, you need to realize it will not cover everything and at times you will find different places have a different set of tests they use. The problem is these tests are only presumptive and they will often need to be confirmed to get the results that you need to have.
The Rapid Stain Identification test is one that is going to allow you to confirm the presence of blood based on the detection of glycophorin A. An enzyme-linked testing that will allow you to identify the blood and get it down to the blood groups even. You will notice that some of the tests are going to be called crystal tests and this is because these tests allow you to confirm the presence of blood by looking at the formation of haemochromogen crystals. You will find that you can find even further techniques that take more time as this will involve a microscope to look at the blood cells.
You will notice that a large number of techniques have been developed for the identification of body fluids in the context of forensics and can range from the quick presumptive testing to the in-situ test that is going to be in a laboratory. All of these techniques have some type of problems though. The main