An Air Force RB-47, equipped with electronic countermeasures (ECM) gear and manned by six officers, was followed by an unidentified object for a distance of well over 700 mi. and for a time period of 1.5 hr., as it flew from Mississippi, through Louisiana and Texas and into Oklahoma. The object was, at various times, seen visually by the cockpit crew as an intensely luminous light, followed by ground-radar and detected on ECM monitoring gear aboard the RB-47.

Article link
http://www.ufoevidence.org/cases/case665.htm

Video:
http://www.youtube.com/watch?v=dSliYNXXy_A&eurl=http%3A%2F%2Fwww.unexplained-mysteries.com%2Fviewvideo.php%3Fid%3DdSliYNXXy_A%26tid%3D155015&feature=player_embedded

This is evidence. As far as it being the best evidence, there is way more documented UFO information than the public is aware of because the media treats it as trash. Our astronauts have watched UFO from space and talked specifically about them over recorded transmissions and took some photos to boot. The military has even better documentation.

While this is credit account of an unidentified flying object, it is not evidence of anything extra terrestrial.

Certainly, that could've been just a simple recognizace system for verifying the response of our civilization to an UFO -- a regular occurrence before sending a group of tourists from the future...