my understanding - there is currently no software package created to allow this (ie modified kernel or whatever is necessary). government doesn't have resources/knowledge to do it on its own, otherwise they would already have it.

once this is created, apple would pressed HARD by all authorities to re-use it for all iphones captured. these days we know damn too well that people in CIA, aNSA etc don't hold any reasonable moral values when it comes to privacy of about anybody on this planet.

plus it could be taken from this specific phone and very probably copied anywhere, without any apple approval or court order.

if government was playing mr nice guy till now, there would be at least some hope and faith. currently, there is simply none.