Blood is very sticky stuff. It stains. Everyone knows that a cloth with blood requires soaking in cold water and laundering and then only hopefully the stain will be gone.
...Experience has shown that it’s virtually impossible (click here) to clean-up blood spatter at a crime scene so that no DNA can be detected. And that is after using water, solvents, cleaning fluids and other assorted chemicals in multiple washings to remove all visible traces of blood. Even though the human eye cannot see trace amounts of blood residue, luminol will detect it. Luminol is so sensitive that it can detect the presence of blood in serial dilutions down to 1:100,000. If luminol can detect it, PCR testing certainly will type the DNA present.
Other chemicals used in presumptive testing for the presence of blood
are leuchomalachite green, phenolphthalein, Hemastixs, Hemident, and
Bluestarr. All are as equally sensitive to blood as Luminol except for
leuchomalachite green (1:10,000). For more information, please read this
Technical Note in the Journal of Forensic Science, published in 2006. JFS is a peer reviewed professional journal....
The tiniest amount of blood will result in positive findings. I am quite confident Mr. Martin's evidence was reviewed by more than just one forensic specialist. There should be no confusion or debate. Seriously. There are many instances of crime scenes far older than seven hours that have proven to tell the tale of what occurred.
...Experience has shown that it’s virtually impossible (click here) to clean-up blood spatter at a crime scene so that no DNA can be detected. And that is after using water, solvents, cleaning fluids and other assorted chemicals in multiple washings to remove all visible traces of blood. Even though the human eye cannot see trace amounts of blood residue, luminol will detect it. Luminol is so sensitive that it can detect the presence of blood in serial dilutions down to 1:100,000. If luminol can detect it, PCR testing certainly will type the DNA present.
Other chemicals used in presumptive testing for the presence of blood
are leuchomalachite green, phenolphthalein, Hemastixs, Hemident, and
Bluestarr. All are as equally sensitive to blood as Luminol except for
leuchomalachite green (1:10,000). For more information, please read this
Technical Note in the Journal of Forensic Science, published in 2006. JFS is a peer reviewed professional journal....The tiniest amount of blood will result in positive findings. I am quite confident Mr. Martin's evidence was reviewed by more than just one forensic specialist. There should be no confusion or debate. Seriously. There are many instances of crime scenes far older than seven hours that have proven to tell the tale of what occurred.
