Karda, I don't think warranty service would violate any of the law I posted above. And line 4 of the exemptions clearly says 3" or less blade length are exempt from all these laws. So no I dont expect them to break any law. Don't forget they aren't afraid to produce these knives they just wont fix them.
(4) the possession, and transportation upon his person, of any switchblade knife with a blade three inches or less in length by any individual who has only one arm.
Re-read subsection 4. It does not say that switchblades under three inches blade length are exempt from the law restricting interstate transportation of said switchblades. It merely says possession and transportation by a person with only one arm of a switchblade with a blade length under 3 inches is allowed.
This will not protect them if they send it through the mail. It might work, if the company wanted to go out, and hire a one armed person, and then pay them to get in a car and drive the knife to you. Since the blade has to be carried on the person of the one armed man, he can't even fly to you. He might be able to ride a train.
The statute also exempts common carriers. So Spyderco can ship the knife and the shipping company will be protected from prosecution.
But you are talking about up to a 5 year prison sentence and 2000 fine............................ and for some reason they won't take your non attorney "maybe" opinion that, plain language of the statute aside, does not protect them from prosecution.
Wow, what crazily bad customer service.............Oh, wait, that is called "I don't want to go to prison" reasoning.
You are also saying "they make and sell, but won't service my knife".
Oh, on the contrary, they will service that knife. Just not for you, because you are not exempt from the law allowing interstate commerce and shipping as a military or law enforcement.
You see, the one armed, under 3 inch blade exception, does not mention any exception for shipping to or from a one armed man (assuming you are actually a one armed man).
This provides no protection to them.