The L-1B visa requires an individual to have specialized knowledge of the company, its product or service, and its application in international markets or to have an advanced level of knowledge of processes and procedures of the company.
In 2004 changes in the law were enacted governing the placement of L-1B workers at third party sites. In such cases, employers must demonstrate that they will continue to exercise control over those employees and that any labor for hire contract with a third party is only in connection with the foreign national's specialized knowledge of the petitioner's products or services.