A recent article on HN made me realise that the U.S. might be on the right track for fixing this. The article was called Game Theory's Cure For Corruption Makes Us All Cops [0]. The solution is in your pocket.

Imagine a city where police commit blatant traffic violations and never ticket one another. The authorities could decrease power inequalities by developing an online system in which all citizens are able to anonymously report dangerous drivers. Anyone who received too many independent reports would be investigated – police included. This sounds almost laughably simple, and yet the model indicates that it ought to do the trick. It is, after all, essentially the same system used by many online communities.

[0] http://aeon.co/magazine/society/game-theorys-cure-for-corrup...