I think the worrisome thing here is that there isn't any restriction or regulation around what people should be looking for at the airport on someone's phone slash what are the markers for why they should be scrutinized. Even with regulation, this kind of power gets abused. Just look at cops in the US. Even though there are rules around when a cop is allowed to search someone's vehicle, cops often find ways around it to do so and get away with it, because it's often a cop's word against a regular citizen's word (and to get anything changed, it's often a long, drawn out and expensive legal battle.)