The only time I was ever sent for a search was when I declared nothing after a weekend in Mexico. I really didn't buy anything, was just there for some diving. That opened up a long line of questioning that went something like this:

C: You were in Mexico and didn't buy anything?
Me: Correct
C: Not even a t-shirt?
Me: Correct
C: why?
Me: I go to Mexico a lot and did not need to buy anything
C: What do you do that you go to Mexico so much?

Blah, Blah, Blah. You can see where that line of questioning was going. Anyway, I got to the table and started ripping everything apart before an inspector even came over. Once he came over he asked what I was doing. I explained that I had a tight connection and wanted to get the search over as quick as possible. He looked at me for a second and told me to pack my bags and go catch my flight.

To this day I always put a few t-shirts down even if I didn't buy anything.

Keba