See Horner's email (notifying his whereabouts) and the USADA acknowledgement here. It seems pretty slam-dunk for Horner and against the testers.
http://www.radioshackleopardtrek.com...-testers-wrong
On another note, RSLT have posted Horner's SRM file for stage 18.
http://www.srm.de/news/road-cycling/...pana-stage-18/