They knew where he was living and working and have been watching him for months. Wouldn't it have been extremely easy to get a DNA sample from either location? I wonder if they already have one.
Wouldn't it be funny if the police used his obsession with Jonbenet, just to get him back to the states, so that he could at last be prosecuted for the child porn stuff?
I don't know, but I think they must have something besides his confession to get DHS and the Feds involved. They wouldn't extradite on a whim. The US warrant at this point is still sealed and the DA won't release any details. Amazing--they tracked this guy all over Asia and followed him for 21 days in Bangkok, arrested him there as well-- with NO leaks!
From the early reports it was stated that he knew things that have never been released by the BDP or investigators. Of course, early reports also said that they had a DNA match, so who knows. They are also looking at his possible involvement in another case in California.
His resume really creeped me out with all the talks of bathing the children. EW, EW, EW!