I have been reading it for the last half hour or so, and the best I can find is 611, which says that "the agency shall, free of charge, conduct a reasonable reinvestigation to determine whether the disputed information is inaccurate and record the current status of the disputed information, or delete the item from the file in accordance with paragraph (5), before the end of the 30-day period beginning on the date on which the agency receives the notice of the dispute from the consumer or reseller."
There is nothing that "spells out" what they must do to verify. Am I missing something?