Interstate Transport Act of 2017 This bill permits an individual to transport a knife for any lawful purpose between two places (e.g., states) where it is legal to possess and carry such knife. The individual must comply with specified requirements. The bill prohibits the arrest or detention of an individual for a knife violation unless there is probable cause to believe the individual failed to comply with specified requirements. An individual may assert compliance with this bill's requirements as a claim or defense in any civil or criminal action or proceeding.