The below snip is what I found interesting. A little more detail than we had before.
http://transcripts.cnn.com/TRANSCRIPTS/0805/21/acd.01.html
GANNON: We were -- we actually -- the smiley face is only 1/13th of the total piece of information that we've uncovered at the scene. What we've done is we found other symbols, and markings and taggings, always specific to these regions, and broken them down, whether we thought they were different pods, which is what some of the symbols would be specific to just Minnesota and Wisconsin and the 12 or 18 victims were there.
And then there were other ones that were specific to the region of Illinois and Indiana, and another set of symbols to Pennsylvania, Ohio and New York.
COOPER: So is it, in your mind, a -- it's, what, a group of serial killers? Or is it a gang? Or who do you think is doing this?
GANNON: Gang not in the traditional sense of a gang, but the same type of organizational structure of a gang. And we believe that they're communicating with each other.
COOPER: But you don't have any idea of how?
GANNON: No -- well, I mean, I just -- hypotheses of either cell phones, got cell phones, disposable cell phones or, obviously, through the Internet. We actually had one of the investigations where there was a message on a -- on the computer that we were very interested in.
And the law enforcement agency, without mentioning which case, was unable to track it back to the original IP number, which obviously would have been very crucial to us.