| Ah, but they can take recordings with a grain of salt if some come from a trusted source or if they have a combination of live and recorded auditions in the same round. It is usually the case that prescreening rounds will consist entirely of recordings made by applicants or someone that they hire. Later rounds can be a mix of self-produced recordings, real-time recordings of live auditions made by an employee of the school, and live auditions directly in front of the judges.
Additionally, some types of editing mistakes that go entirely unnoticed by most listeners are easily detected if you know exactly what to listen for. It takes some practice to make a really clean audio edit. | 
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