The one place we do know of with some level of intelligent life is of course "Earth". So why not include on the next deep probe that will continue on past the solar system a group of highly sensitive instruments that are designed specifically to detect signs of life/intelligence. Once the probe has passed far enough out of the solar system as the Voyagers have, these instruments would be turned on to determine whether our presence is detectable and if so how. If we can't then I think the chances of detecting another intelligent race of beings that isn't interested in being found are slim. But on the other hand if some marker of our occupation of this planet stands out then maybe we will find our galactic neighbors.

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Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.