Indeed it is true that on occasion a video or still photo produces what can arguably be one of our ships, but the point is still hotly contested. In the minds of the populace at large, who cannot discern fraud from fact, the point is still open. In the minds of experts, who on occasion are fooled, even a fraction of a percentage point puts the issue into the category of arguable. We do indeed allow some shots to develop, and others not. Reports from disappointed humans, who took a shot that didn't turn out, tends to strengthen skepticism, and we want some of that for the modulating effect. Were there to be a flood of shots challenging the experts, from humans without the capacity to produce high quality fraud, the level of anxiety would raise too rapidly. An occasional shot, even from a hick incapable of producing a high quality fraud, is arguable. Perhaps the hick had accomplices in a fraud. It's arguable.
The rule is, and will be for the near future, we keep the issue constantly before the populace, with a steadily increasing level of discussion, but always, always, with an element of doubt.
This element of doubt is necessary during the Awakening so your populace does not become unduly alarmed. A faint, a palpitating heart, distractible excitement, arguing with friends and co-workers for a few days, and increased interest in UFO subjects - none of this is considered a show stopper. Were the entire populace to react like this, there would be no problem. The Awakening would occur tomorrow. What we seek to avoid is the nervous breakdown, the fear in friends and co-workers raising to such a level that they take violent steps against the reporter, or the intensity of fear in the observer that would make them susceptible, incline them, toward giving The Call to the Service-to-Self. For this reason visitations are currently recorded only in the subconscious.
Note: below added during the Sep 7, 2002 Live ZetaTalk IRC Session.
The Element of Doubt rule must be interpreted in light of the absolute certainty that the alien presence is real, or not. The majority of the populace polled believes that the alien presence is real, intelligent life elsewhere possible, without any absolute proof in hand. This is what the Awakening desires, a gradual comfort level increase, without any contactees being burned at the stake by hysterical religious leaders whose turf has been threatened. ZetaTalk Accuracy is designed to allow the populace to discern truth in a message, vs newcomers to the scene who want the stage but invent the message. This does not prove that aliens are real, as Nancy could be getting the message from the government, be a front for release of this information, deniable where a straight-forward government source would not be deniable. Thus, the Element of Doubt is maintained.