With all due respect to your lawyer, he and you are mistaken. The statute exempts the common carriers from liability, but not the person who introduces the switchblade into interstate commerce. Honestly, I'm glad that some dealers take the risk of shipping them, but make no mistake, they're taking a legal risk.
It's certainly possible for my attorney to be wrong, or for me to not remember his words perfectly. Here's my understanding of the federal switchblade act and how it pertains to the specific concern expressed by the OP about shipping a switchblade back to the manufacturer for warranty work-
Section 1242 of the federal switchblade act specifically forbids the transportation of switchblades for the purpose of "interstate commerce", as in- buying and selling.
And while the person selling the switchblade might be violating the law by shipping the knife out of state for the purpose of selling it (commerce), shipping a knife back to the manufacturer for warranty work is not "commerce" since the knife is neither being bought or sold, merely repaired.
Likewise, the person buying a switchblade is not violating section 1242 because they are not the one shipping the knife across state lines.
But like I said, that's my understanding.
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