Entering the facility? Did she get off the bus? But OK, why should a federal facility be restricted?
>>Did she get off the bus?
It does not matter. They own the land. They set up a perimiter and check everyone entering the land. Imagine a military base with several buildings, with a checkpoint at the entrance. Once she is in they would not know if she got off the bus or not. It makes more sense to have a perimiter. Checking ID for half the bus, then trying to run after the bus and watch who gets off, and try to remeber if they were the ones who showed ID or not, would be silly.
By the way, according to another tread, she purposefully took this bus knowing the situation when she could have taken other busses to her destination that did not enter the Federal facility area.