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Tesla says California's Autopilot action violates its free speech rights
(www.theregister.com)
This is a most excellent place for technology news and articles.
It looks like their main argument is that the state had the last 10 years to object and only now did so and therefore imply that it was reasonable to infer that because the state didn't raise objections in that time, that Tesla shouldn't be found guilty of false advertising.