In fact, yes. C.f. there many laws about mail tampering for the post office. When the government has to deal with the data in "normal, non-criminal" situations,

In fact, yes. C.f. there many laws about mail tampering for the post office. When the government has to deal with the data in "normal, non-criminal" situations, and not just "special investigative" ones, there tends to be better safe-guards in place.