(I agree with @rogermue but I think I have another way of explaining this to you that will be easier to understand.)
Only one search can occur at a time. So we have to put the three searches in different places on the time line. But the present tense can only focus on one spot on the time line at a time.
Imagine a cartoon strip or anime sequence with captions, showing airport officials rifling through Lisa's luggage. Caption: "Lisa has her luggage searched."
Some amount of time passes, and then there is another drawing, similar to the first, with the caption, "Lisa has her luggage searched AGAIN."
Some time passes... and now there is a third search drawing; the caption says, "Lisa has her luggage searched a third time -- arggh!"
Those three pictures happen at three discreet moments in time. You can't have one picture showing all three separate searches. So you can't have one caption describing all three.
However, I can say that as mistakes go, that one is not one of the more noticeable ones. I had to think about it a bit.