Washington State is a bit different. Design professionals are required to prepare or have reasonable charge over those who prepare the plans.
RCW 18.08.370 (ARCHITECTS)
Issuance of certificates of registration—Seal, use.
(1) The director shall issue a certificate of registration to any applicant who has, to the satisfaction of the board, met all the requirements for registration upon payment of the registration fee as provided in this chapter. All certificates of registration shall show the full name of the registrant, have the registration number, and shall be signed by the chair of the board and by the director. The issuance of a certificate of registration by the director is prima facie evidence that the person named therein is entitled to all the rights and privileges of a registered architect.
(2) Each registrant shall obtain a seal of the design authorized by the board bearing the architect's name, registration number, the legend "Registered Architect," and the name of this state. All technical submissions prepared by an architect and filed with public authorities must be sealed and signed by the architect. It is unlawful to seal and sign a document after a registrant's certificate of registration or authorization has expired, been revoked, or is suspended.
(3) An architect may seal and sign technical submissions under the following conditions:
(a) An architect may seal and sign technical submissions that are: Prepared by the architect; prepared by the architect's regularly employed subordinates; prepared in part by an individual or firm under a direct subcontract with the architect; or prepared in collaboration with an architect who is licensed in a jurisdiction recognized by the board, provided there is a contractual agreement between the architects.
(b) An architect may seal and sign technical submissions based on prototypical documents provided: The architect obtains written permission from the architect who prepared or sealed the prototypical documents, and from the legal owner to adapt the prototypical documents; the architect thoroughly analyzes the prototypical documents, makes necessary revisions, and adds all required elements and design information, including the design services of engineering consultants, if warranted, so that the prototypical documents become suitable complete technical submissions, in compliance with applicable codes, regulations, and site-specific requirements.
(c) An architect who seals and signs the technical submissions under this subsection (3) is responsible to the same extent as if the technical submissions were prepared by the architect.
RCW 18.43.070 (ENGINEERS)
Certificates and seals.
The board shall issue a certificate of registration upon payment of a registration fee as provided for in this chapter, to any applicant who, in the opinion of the board, has satisfactorily met all the requirements of this chapter. In case of a registered engineer, the certificate shall authorize the practice of "professional engineering" and specify the branch or branches in which specialized, and in case of a registered land surveyor, the certificate shall authorize the practice of "land surveying."
In case of engineer-in-training, the certificate shall state that the applicant has successfully passed the examination in fundamental engineering subjects required by the board and has been enrolled as an "engineer-in-training." In case of land-surveyor-in-training, the certificate shall state that the applicant has successfully passed the examination in fundamental surveying subjects required by the board and has been enrolled as a "land-surveyor-in-training." All certificates of registration shall show the full name of the registrant, shall have a serial number, and shall be signed by the chair and the secretary of the board and by the director.
The issuance of a certificate of registration by the board shall be prima facie evidence that the person named therein is entitled to all the rights and privileges of a registered professional engineer or a registered land surveyor, while the said certificate remains unrevoked and unexpired.
Each registrant hereunder shall upon registration obtain a seal of the design authorized by the board, bearing the registrant's name and the legend "registered professional engineer" or "registered land surveyor." Plans, specifications, plats, and reports prepared by the registrant shall be signed, dated, and stamped with said seal or facsimile thereof. Such signature and stamping shall constitute a certification by the registrant that the same was prepared by or under his or her direct supervision and that to his or her knowledge and belief the same was prepared in accordance with the requirements of the statute. It shall be unlawful for anyone to stamp or seal any document with said seal or facsimile thereof after the certificate of registrant named thereon has expired or been revoked, unless said certificate shall have been renewed or reissued.