If you're looking for CYA, I'd say helmet cam. Documents that you're doing head-checks for turns and lane changes. And if you are in a collision, leave your lid on and it's documenting interactions afterward if the other person sticks around.
As previously mentioned, racing orgs tend to insist on a hard mount to the bike, sometimes tethered with additional safety wire.
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Let he who has never re-used a crush washer cast the first stone...
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