Well, our DC sniper isn't exactly following the same tactics. There has been quite a bit of forensic contamination. That is how they've been able to link all 12 events.
Chair ~~~ I think virtually all of the "evidence" they've had for linking the events is from the bullet fragments in the victims.
I apologize for being so graphic but I'm pretty sure about that.
ALL ~~~ I would love to jump into your discussion about the creation and such but, alas, it's payroll day. I've only been able to skim your posts but it looks like a fascinating conversation.