I have been asking TSA for a definitive list or a referenc to a definitive list of these kinds of items for some time now. I want to know becaise I am tired of my luggage being ravaged through and reasssembled like someone threw everything in the bag and sat on it to close it. No such luck on getting the list - I just is is super secret information.
I am told, but canot be 100% sure that the following will also raise suspicion and cause a manual search (disassembly and unpleasant random repacking):
peanut butter
bags of brown sugar
bags of ground coffee (maybe beans too)
brownie mix
cake mix
cake frosting in plastic cans
baking powder
cornstarch
Now you ask why would I be carrying these items - because you can't get them in Bulgaria and I wanted some comforts of home to kep me sane.