Disgruntled current and former agents testified anonymously from behind a screen.

The rules, which in essence constitute a new body of law distinct from military and civilian law, allow, for example, witnesses to testify anonymously for the prosecution.

At the hearings in May, most victims chose to testify anonymously.

In addition, some agents may testify anonymously.

The inspectors for the F.A.A., according to Congressional auditors and an inspector who testified anonymously, are ill-supervised, ill-trained for their work, and fearful that they will lose their jobs if they press airlines too hard.

A former airline employee who testified anonymously said that the inspectors usually looked only at paperwork, not at real airplanes, and that fooling them was easy.

Four former military officers have also said they will testify anonymously.

The inspector and a longtime airline employee testified anonymously from behind a screen.

After she testified anonymously before the City Council, she was fired.

The Interior Minister, Nestor Martinez, favors leaving untouched many features of special "faceless" courts that protect judges, lawyers and witnesses by allowing them to testify anonymously.