It would depend on what had happened. If you were going to be charged with some sort of serious offence then a warrant could be obtained to seize evidence. I seem to remember a recent case where the sky diver instructor who had a client die in a crash, swallowed the memory card from his Go-Pro. They arrested him and waited till the evidence "appeared". Question you might want to ask yourself before recording your ride. Do I really want what I am about to do, to be available for public viewing in the future, possibly being used against me in court? If the tree falls in the forest when nobody is around, it may make no noise...but if a camera and a microphone records the fall, a jury may hear the noise...if you know what I mean.