The Office of Special Counsel for Immigration-Related Unfair Employment Practices (part of the Department of Justice) issued a two-page best practices guide for Job Postings. Employers should be familiar with the do’s and don’ts of job postings, whether online or in the newspaper. Language such as “U.S. Citizens Only” or “We Prefer H1B Workers” is suspect and in some instances illegal because it can lead to discrimination based on citizenship or national origin.
For more about job postings read my post from April 12th — Acceptable Job Posting Language and Compliance with Anti-Discrimination Laws.