Necro- I seem to recall that either A) taking 20 on Gather Information always attracts notice if you're looking for sensitive info or B) You can't learn particularly sensitive information by taking 20 on Gather Information or C) Both. But I don't have my book with me, so I'm not sure about that. If A) is true, taking 20 on Gather Info may not be the best plan.
I think you can take a penalty on gather info to avoid attracting any attention, but I think doing that precludes taking 20.
Edit- tried to use Aid Another to give you +4 on your check (due to Teamwork 2). Did I need to roll a DC 10 check to do so? Someone with the book, please let me know.
In any case, no more rules posts for now. I'm going to sit back, relax, and enjoy the game