Just a couple of points...
-To put things in perspective, 267 people in 8 years is hardly a big deal. and is obviously not common practice.
-that's 0.00089% of the population, there's no conspiracy here.
-If you're not breaking the law, your phone isn't tapped. period.
-if you're worried about it, chances are, your doing something you shouldn't be
-If the cops want to put someone in jail and build a case against someone, they won't use these powers, simply because if they need to use the evidence in court, using these emergency powers without cause will mean the case would get thrown out.
-These things are required for situations like hostage takings, kidnapings, standoffs etc.
-Google is doing more information gathering than these guys.
I don't understand what you're worried about, or envisioning? Do you think the cops are sitting in their offices and thinking to themselves, hey lets listen in to Ms Jones talk to her friend down the street. They might be talking about the movie they just saw.
I assure you, the cops will only go through the trouble to set this stuff up if it's absolutely necessary. It's a lot of trouble, and it's expensive.