Letters Written by a Turkish Spy

This same DNA sequence profile turned up as a component of another Ripper letter, and two Walter Sickert letters. Genetic locations from this DNA sequence were found on other Sickert items, such as coveralls he wore when he painted. The DNA in all but the single-donor Ripper stamp is mixed with other genetic sequence profiles from other people. (This is neither surprising nor damning.) The DNA evidence is the oldest ever tested in a criminal case. This is only the beginning. We aren't finished with our DNA testing and other types of forensic analyses. These could go on for years as the technology advances at an exponential rate. There is other physical evidence as well. Forensic scientists as well as art, paper, and lettering experts found the following: a Ripper letter written on artists' paper; watermarks on paper used in Ripper letters that match watermarks on paper used by Walter Sickert; Ripper letters written with the waxy-soft crayonlike ground used in lithography; Ripper letters with paint or ink applied with a paintbrush ...»