Perhaps the 'protocols' are the items to be concealed, where/how they'll be concealed, and how to approach the checkpoint, ie, opt out to guarantee an NoS screening or have Pre on the BP to get that level of screening.

In theory, each time the tests would be tweaked as necessary to particularly address the previous cycle's weakest points.
The last round was so bad that I wouldn't expect they need to make too many drastic changes.