Originally Posted by
nuyawkr
The first time (with carry-on) the bag got pulled for hand inspection, with one TSA guy calling back to the X-Ray operator, "It's just some energy bars." The last two trips (with checked bags), I got home and found the friendly "Your bag has been opened by TSA" slips inside.
Here's your explanation: Chocolate is very dense and when in checked baggage can look like explosive material. (The same is true of thick books.)
There is no such problem with the x-ray machines used for hand luggage. I never put chocolate in checked baggage for that very reason.