Oblivion 2013 *spoiler*

Warning: Spoilers of the movie "Oblivion" are present throughout the post.

When Jack-49 went missing, Vika-49 immediately asked mission control to find a drone to find him and the drone almost immediately found a DNA trail. But when Jack-49 went missing after meeting with Vika-52, he then goes to Julia and then proceeds to what I think is a night in his lodge, yet it's only in the next day when Jack-49 went to the humans Scavs hide out that a scene showed that fancy touchscreen and the drones being scrambled to find Javk-49. Same could be said about Jack-52, why wasn't Vika-52 watching him through his plane and when the drones were scrambled, why didn't they pick up on Jack-52's DNA trail before they picked up on Jack 49's trail?