NSA said in a statement Friday that there have been “very rare” instances of willful violations of any kind in the past decade, and none have violated key surveillance laws. “NSA has zero tolerance for willful violations of the agency’s authorities” and responds “as appropriate.”Willful violations? Zero tolerance? What do those phrases mean to the NSA? I especially want to know about these "key surveillance laws." They sound important. I assume they're written down somewhere. And if spying on one's lover doesn't violate them, then what does?