Nothing in this section shall preclude the Federal Bureau of Investigation, or other Federal law enforcement agencies, from continuing to use authorized, non-coercive techniques of interrogation that are designed to elicit voluntary statements and do not involve the use of force, threats, or promises.
Such suits have the effect b and, given the nature of the litigants, are seemingly intended b to suppress what is, arguably, the most important force-multiplier available for homeland security: voluntary action by responsible citizens.