Whilst the mucky-mucks at the FBI etc might tech illiterate and maybe only risen to the top by virtue of the Peter Principle, I am certain there is a huge army of some of the best tech minds in their employ.
Is it beyond imagination that they have actually cracked the security? What better way to slurp data from important suspects than by ensuring they use something widely known to be impenetrable?
To ensure the high profile crims use that "impenetrable" device just kick off a high profile case every now and then, which they hope to lose because it so obviously flies in the face of what the "Land of the Free" (wish we had a sarcostrophe ) stands for.
Wasn't there a tinfoil hat icon at one point?