I'm not sure that putting the data into a metaphorical locked-box is sufficient. Someone with an interest in seeing the data will always have the keys. What you

I'm not sure that putting the data into a metaphorical locked-box is sufficient. Someone with an interest in seeing the data will always have the keys. What you describe is not completely different from the purpose that FISA courts are supposed to serve, and I don't think those are a great success in protecting freedom and privacy according to the Constitution.