Re: Both sides?
The phrase: "Use of this product in a manner inconsistent with its labelling is a violation of Federal law." is meant to protect the supplier from lawsuits. If a person tries to sue you for using the product wrong, they admit to a violation of federal law, and as "ignorance of the law is no excuse", they might be prosecuted for it, and become negligent in the process, voiding the lawsuit.
Actually pretty clever.
Not to significant other: Do not use bug killer as hair spray!
Biting the hand that feeds IT
