The WDIR is issued for informational purposes and is required to reveal information concerning evidence of wood-destroying insects only. The WDIR inspector must report all visible evidence of wood-destroying insects and any conditions conducive to subterranean termites. The WDIR is not a warranty as to the absence of wood-destroying insects; it is a report of the visible presence or absence of wood-destroying insects at the time of the inspection.

More information: http://www.ncagr.gov/SPCAP/structural/pubs/wdir.htm