Visible crew/equipment: During the scenes in Lafferty's house, crew/camera movements are reflected on the large glass fish tank near the front door. (00:27:40 - 00:35:00)
Visible crew/equipment: When Gibbs tells Tony and Ziva to go to Wilkerson's home they pass Abby on their way to the elevator, and just as Ziva waves her hand at Abby, in this shot and a following shot a crew member is visible as he's ducking down by Tony's cubicle, under the monitor on the right side of the screen. (00:04:10)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.