In most cases, it is perfectly legal to preserve a turtle shell. However, the legality of this can change from one case to another. It is generally not allowed to import shells into the United States. Additionally, with endangered turtle species, it may be against the law to sell or exchange souvenirs made of the turtle’s body parts such as the shell. Even if you are to preserve a turtle shell, selling that shell can be illegal depending on your locality and the species. These laws are in place to stop poachers from exploiting endangered species for souvenirs and other products.