While TSA's ineptness at providing security at our airports is mentioned, this report really concerns other methods of transportation, i.e., rail.
However, it does say this about WBI:
We found that in response to the attack, TSA had revised the AIT procurement and deployment strategy, increasing the planned deployment of AITs from 878 to 1,800 units and using AITs as a primary—instead of a secondary—screening measure where feasible. While officials said AITs performed as well as physical pat downs in operational tests, it remains unclear whether the AIT would have detected the weapon used in the December 2009 incident based on the preliminary information we have received. We are currently assessing TSA’s operational
testing of the AIT.