Did someone (Mark Levin?) say that 99.9% of all FISA warrant applications are approved by the secret FISA court?

That tells you the FISA judges place almost complete authority/trust with the FBI/DOJ representatives that supply the information and request for the warrant. We've now seen where that can lead. (This is discounting the possibility of any shenanigans from the judges themselves).

According to the current FISA procedures, any potential exculpatory information about the target needs to be provided to the court by the same officials that are requesting the warrant. This alone is a conflict of interest, and its hard to fathom how even reasonable investigators could be expected to comply fully.

If this position of power is to continue, those placed in such positions of trust must have demonstrable perfection in their ethics and their candor.

Short of that, the system should require some kind of checks and balances.