http://www.eeoc.gov/laws/practices/ Job Assignments & Promotions It is illegal for an employer to make decisions about job assignments and promotions based on an employee's race, color, religion, sex (including pregnancy), national origin, age (40 or older), disability or genetic information. For example, an employer may not give preference to employees of a certain race when making shift assignments and may not segregate employees of a particular national origin from other employees or from customers.