"How do you ‘legally’ inject/make public/use as evidence?"
———————
This is a bigger problem that's been going on in the justice dept and NSA for years.
They call it parallel construction. Americans call it information laundering.
It's completely illegal and bypasses the protections of the constitution.
This black hat situation is so extreme that I think it's fine that they're doing it here; but once this mess is resolved, people engaged in "parallel construction" need to be facing a mandatory minimum 5-year prison sentence. It's a blatantly unconstitutional action by very powerful people.
Parallel construction is the foundation of a dragnet surveillance society.