The reason can be found in Justice Dept. Report Cites F.B.I. Violations:
The Federal Bureau of Investigation found apparent violations of its own wiretapping and other intelligence-gathering procedures more than 100 times in the last two years, and problems appear to have grown more frequent in some crucial respects, a Justice Department report released Wednesday said.When Congress or the White House says "trust us," the appropriate answer is "no." That's not how it works. And this is why:
While some of these instances were considered technical glitches, the report, from the department's inspector general, characterized others as "significant," including wiretaps that were much broader in scope than approved by a court and others that were allowed to continue for weeks or sometimes months longer than was authorized.
In one instance, the F.B.I. received the full content of 181 telephone calls as part of an intelligence investigation, instead of merely the billing and toll records as authorized, the report found. In a handful of cases, it said, the bureau conducted physical searches that had not been properly authorized.These programs have oversight, but still don't follow the fairly simple rules. What must happen in cases where there's no oversight?