You still didn't answer the question of why.

Why make this person crack.

Uh... The person has already exhibited enough suspicious behavior and circumstantial evidence to get frisked & questioned in a back room and their ticket cancelled. Indications are this is the kind of person being looked for, and if is, at this point is trying very hard to not reveal any further evidence of ill intent. Time to crack the egg and see if it's rotten.