Quis Custodiet Ipsos Custodes?

David P. Goldman, who blogs as Spengler at the PJ Media website, looks at the Nunes memo on Obama-directed weaponization of the FBI and DOJ. He summarizes:

The Democratic National Committee and the Clinton campaign paid for a pile of inflammatory rumors about Trump, which it then sold to the press. The FBI—in full knowledge of this—then took the press reports to a court as “evidence” to obtain permission to surveil the Trump campaign.

No foreign intelligence service could learn anything from the House Republicans’ memo except that the FBI retailed the mercenary inventions of a retired British spook and concealed the provenance of its information.

Some may consider it dangerous to expose senior officials of America’s counterintelligence service as political hacks and fools. They needn’t worry. America’s adversaries have been well aware of this for a long time.

So ... who polices the policemen? Who investigates wrong-doing by the nation’s police force and its prosecuror’s office? I wish I knew a good answer to this very serious question. Maybe another special prosecutor?