19 CFR § 111.2 - License and district permit required.
(a) License -
(2) Transactions for which license is not required -
(i) For one's own account. An importer or exporter transacting customs business solely on his own account and in no sense on behalf of another is not required to be licensed, nor are his authorized regular employees or officers who act only for him in the transaction of such business.
(ii) As employee of broker -
(1) Authorized to sign documents. The broker has authorized the employee to sign documents pertaining to customs business on his behalf, and has executed a power of attorney for that purpose. The broker is not required to file the power of attorney with the port director, but must provide proof of its existence to Customs upon request; or
(2) Authorized to transact other business. The broker has filed with the port director a statement identifying the employee as authorized to transact customs business on his behalf. However, no statement will be necessary when the broker is transacting customs business under an exception to the district permit rule.
(B) Broker supervision; withdrawal of authority. Where an employee has been given authority under paragraph (a)(2)(ii) of this section, the broker must exercise sufficient supervision of the employee to ensure proper conduct on the part of the employee in the transaction of customs business, and the broker will be held strictly responsible for the acts or omissions of the employee within the scope of his employment and for any other acts or omissions of the employee which, through the exercise of reasonable care and diligence, the broker should have foreseen. The broker must promptly notify the port director if authority granted to an employee under paragraph (a)(2)(ii) of this section is withdrawn. The withdrawal of authority will be effective upon receipt by the port director.
(iii) Marine transactions. A person transacting business in connection with entry or clearance of vessels or other regulation of vessels under the navigation laws is not required to be licensed as a broker.
(iv) Transportation in bond. Any carrier bringing merchandise to the port of arrival or any bonded carrier transporting merchandise for another may make entry for that merchandise for transportation in bond without being a broker.
(vi) Foreign trade zone activities. A foreign trade zone operator or user need not be licensed as a broker in order to engage in activities within a zone that do not involve the transfer of merchandise to the customs territory of the United States.
(b) District permit -
(2) Exceptions to district permit rule -
(A) Employee working in client's facility (employee implant). When a broker places an employee in the facility of a client for whom the broker is conducting customs business at one or more other locations covered by a district permit issued to the broker, and provided that the employee's activities are limited to customs business in support of that broker and on behalf of that client but do not involve the filing of entries or other documents with Customs, the broker need not obtain a permit for the district within which the client's facility is located;
(B) Electronic drawback claims. A broker may file electronic drawback claims in accordance with the electronic filing procedures set forth in part 143 of this chapter even though the broker does not have a permit for the district in which the filing is made;
(C) Electronic filing. A broker may electronically file entries for merchandise from a remote location, pursuant to the terms set forth in subpart E to part 143 of this chapter, and may electronically transact other customs business even though the entry is filed, or other customs business is transacted, within a district for which the broker does not have a district permit; and
(D) Representations after entry summary acceptance. After the entry summary has been accepted by Customs, and except when a broker filed the entry as importer of record, a broker who did not file the entry, but who has been appointed by the importer of record, may orally or in person or in writing or electronically represent the importer of record before Customs on any issue arising out of that entry or concerning the merchandise covered by that entry even though the broker does not have a permit for the district within which those representations are made, provided that, if requested by Customs, the broker submits appropriate evidence of his right to represent the client on the matter at issue.
(ii) Filing of drawback claims. A broker granted a permit for one district may file drawback claims manually or electronically at the drawback office that has been designated by Customs for the purpose of filing those claims, and may represent his client before that office in matters concerning those claims, even though the broker does not have a permit for the district in which that drawback office is located.