Karr has been to Boulder... Sandrock said today that Karr described to him many places in Boulder, including Karr describing what type of brick was used on the Daily Camera building.
But who really knows if Karr had been to Boulder before JonBenet showed up dead. I truly believe that Karr has been in Boulder at some point in his life, even if was just to drive by or walk by the Ramsey home so he could feel close to JonBenet even if it was after her death.
The DA probably knows that Karr has been in Boulder before, they just are not talking about it at this point. This would have been something they checked out right away when they started tracking Karr.
"He never applied for a teaching license, certification or authorization here. A file was opened in his name, however, which may have been triggered by the submission of either test scores or fingerprints, signaling his intention to apply for a license. But Karr never did so."
Why submit your test scores and/or fingerprints, unless he was considering asking for a job in the Boulder area?