The problem is, how do they define a "threat"? Shot people? So they are just going to shot without actually piling up evidence as well? I don't know if these "metadata" can be used in court. Looking more and more like a police state. The problem is that since no one knows how much they can find out about people and the extent of these operation, we can't tell if they are actually using this just for security or something else. The state don't always have the people's best interest in mind.
Here in our country it's not admissible,you can go to jail if you intercept data without a court order,even the cia version here in our country are not allowed to intercept data,is our democratic law better than the americans,it should not be allowed at all.
That is, if you can prove they've been wiretapping you. Never underestimate the power government can exert. You'd probably never know they've been listening until they use the date accumulated against you.