That was not true, Pirro admitted last Friday, when she withdrew the charge against Hearn, a 67-year-old former competitive canoeist. Interior Department employees told a different story. Now she says she was too quick to believe that story, blaming the Interior Department for concealing relevant information about recognized problems with the liner installation. According to the information provided by the Interior Department, Pirro says, "the damage was entirely caused by vandals." Something similar seems to have happened with three other cases against alleged reflecting-pool vandals, which Pirro's office also dropped.