OK, let's take this on a level. As certain police are obviously doing something even a certifiable cretin would have doubts about, and yet nothing is being done about it, and this has been going on for years, WHY does the US put up with it. Yes, I know, it's the same circles and "We are the State and you do not question Us" logic that we saw in the gun law abuse. Power which corrupts and has reached the point where the checks and controls, which were supposed to operate to stop it, don't, because they've either started to idenitfy with the systems they are supposed to monitor with prudent caution through over-familiarity or because they've been actively subverted, or at the very least they've been allowed to fall into disuse because they never found anything because they were never expected or allowed to find anything. It is equally obvious they cannot actively monito everything all the time, but when nothing happens, then it's time to replace the Watchers, the quis custodiet over the ipsos custodies.
The FBI is charged with prosecuting the Civl Rights Act 1964 as it's fifth Priority, and public Corruption as its fourth. Its first, counter-terrorism, is farmed out to Homeland Security, its second, counterintelligence, and third, cyberwarfare, to a number of other Agencies, so one might begin to wonder what it is actually doing - and why it has been silent in these questions.