a note from willy the whale?

From today's Post:

Federal ocean scientists said yesterday they were unable to determine whether Navy sonar caused a mass stranding of whales on the North Carolina shore last year.

In classic Bushist/military style, they use the absence of 100% incontrivertible hard proof of damage done to whales by sonar to mean, no need for action and no blame for US Navy sonar in the mass beaching.

What would constitute adequate proof? Maybe a signed suicide note by Willy the Whale saying "aargh, this sonar is killing me! I can't take the pain any more, so I intend to beach myself to get away from the sonar. Sincerely, Willy the Whale."