Here's the law pertaining to the collection & ownership of badges-
Legal status of products: It is the responsibility of the buyer, NOT THE SELLER, to ascertain, and obey, all applicable local, state, federal and international laws in regard to the possession and use of any item on this site. All equipment is sold subject to public law 90-351, title III, U.S.D., Section 2511, and any local, state or federal ordinances. Consult your local and state laws before ordering, if you are in doubt. Absolutely no sales to minors! By placing an order, the buyer represents that the products ordered will be used in a lawful manner, and that he/she is of legal age.
(a) Whoever--
(1) knowingly transfers, transports, or receives, in interstate or foreign commerce, a counterfeit police badge;
(2) knowingly transfers, in interstate or foreign commerce, a genuine police badge to an individual, knowing that such individual is not authorized to possess it under the law of the place in which the badge is the official badge of the police;
(3) knowingly receives a genuine police badge in a transfer prohibited by paragraph (2); or
(4) being a person not authorized to possess a genuine police badge under the law of the place in which the badge is the official badge of the police, knowingly transports that badge in interstate or foreign commerce;
shall be fined under this title or imprisoned not more than six months, or both.
(b) It is a defense to a prosecution under this section that the badge is used or is intended to be used exclusively--
(1) as a memento, or in a collection or exhibit;
(2) for decorative purposes;
(3) for a dramatic presentation, such as a theatrical, film, or television production; or
(4) for any other recreational purpose.