In the month since a national security contractor leaked classified documents revealing a vast sweep of Americans’ phone records by the federal government, people across the country have disagreed about the extent to which our expectation of personal privacy must yield to the demands of national security.

Under normal circumstances, this could be a healthy, informed debate on a matter of overwhelming importance — the debate President Obama said he welcomed in the days after the revelations of the surveillance programs.

But this is a debate in which almost none of us know what we’re talking about.

As Eric Lichtblau reported in The Times on Sunday, the Foreign Intelligence Surveillance Court has for years been developing what is effectively a secret and unchallenged body of law on core Fourth Amendment issues, producing lengthy classified rulings based on the arguments of the federal government — the only party allowed in the courtroom. In recent years, the court, originally established by Congress to approve wiretap orders, has extended its reach to consider requests related to nuclear proliferation, espionage and cyberattacks. Its rulings, some of which approach 100 pages, have established the court as a final arbiter in these matters.

But the court is as opaque as it is powerful. Every attempt to understand the court’s rulings devolves into a fog of hypothesis and speculation.