Consider the following photograph. This shirt was recovered from a murder suspect’s basement. It has been packaged in paper by the lead investigator and is in this condition when received at the laboratory. The DNA analyst chooses 3 samples, as delineated by the arrows: one from the stain to the far left, one from the center of the large stain and one from a droplet on the upper right. Complete STR results are obtained from the far left stain and the upper right stain, but not from the center of the large stain. Why?
