crime scene technician jim varnen found several shoe prints and tried to enhance them with a special>> amino black works because it stains proteins. and it's applied to protein stain, in this case, a blood stain. >> in several of the enhanced prints, analysts could clearly see the word "justin," a well-known brand of texas-made boots. >> we knew these footwear impressions in blood that had the pattern of a justin heel was most likely going to be from our assailant because it did not match the only other bleeder at that crime scene, which was our victim. >> unfortunately, these boots weren't unique. >> how common are they? you're probably not from here if you don't have a pair. >> and it was impossible to tell the size of the boot from the print. >> in a justin boot heel, it is possible that you're going to have one physical size that would overlap into several different boot sizes. >> nevertheless, investigators asked both suspects, bob johnson and pool contractor curtis pope, if they owned a pair of justin brand boots. bob johnson owned a pair. but the heel of his boots was larger t