Ok, so let me play de debil's advocate here and postulate the following factual events:

I was fishing an eddy on the Nooksack last fall with a float and roe for hatchery silvers when a fish jumped OVER and ONTO my line between the rodtip and the float and became tangled up...I pulled it in and untangled it and let it go on its way but wouldn't that qualify as a "voluntary" take? Ever seen a kitten play with string?

And another:

Fishing kings one year my (now ex-) wife hooked and played a big ol' dark buck all the way to the bank where we discovered that the hook point didn't even penetrate the fish, although it was attached firmly in the fish's upper jaw. The line was wrapped around its hooked snout, and the hook had caught on the line, essentially turing the hook and leader into a choker...we released that lassoed fish because it was dark and ugly, but I've wondered...voluntary? She wasn't attempting to snag or line the fish...would you call that a legal fluke, or an illegal fluke?