Beyond just the guns it was pretty high tech. He was sharing Google Earth files with Dr. Rutledge and her grad students, Fed-Exing them blood swipes, checking his email all the time for anything useful they might have turned up. During the investigation of Adele’s death, the sheriff had gathered what was politely called physical evidence and used DNA testing to establish that what had happened had happened. Mixed in with Adele’s human DNA there was swine DNA from the perpetrator, and Rufus was able to get that information over to Dr. Rutledge. The odds of a smoking gun genetic match were minimal, but she was able to feed him some "you’re getting warmer/colder" hints that shaped his peregrinations around Texas.