Like others here I know how to avoid selection, or at least minimize the chances. No eye contact, linger so that the wand person is busy as you pass.

Yesterday through Cairns I was selected but I was the only one going through at the time so I was not going to avoid it. We both joked that given it was quiet terrorists were a touch unlikely to come through knowing they would be screened. This process is the most token piece of window dressing in the whole security screening bit. A terrorist with half a brain could get round it