For the past 10 years I've just been travelling within Southeast Asia and have only one major issue whichI attribute to my luggage literally falling apart and breaking open. I used to use soft luggage and overpacking ripped it apart. When I checked in to the airport they had to wrap it up a bit; it looked like a real mess and was actually partially open.
So when I went through customs in Samui they went through my stuff quizzing me on what stuff was such as aspirin, ibuprophen, antacids etc. I don't think they really suspected me of anything but I guess they have to show they are doing their job. My bad; now I use hard backed luggage and don't overpack.
Airport security seems lax in SE Asia. In the Philippines, I had water bottles in plain sight on the side of my backpack and was able to bring it on the plane.
Good to hear they say it's a one off for you John. I know of some North Americans that got checked every time when returning home but that was a awhile ago; maybe things are loosening up the further in the past 9/11 is.