I have a proposal.
Do a lottery and identify 1000 people* per city who will get the same rights as policemen, the same easy, no-questions-asked ability to obtain court orders and the same let off if they "forget" this, and let them loose on the city's legislators and senior members of the police force, or in Washington's case, on the members of Congress themselves.
After all, as they are "serving the people", they should have nothing to hide, no?
* blind selection, so it ought to include a fair percentage of minorities, racial or otherwise.