If you are working in WA, read the faq "What are the break and meal period requirements for adult workers?" provided by WA Labor & Industries for answers that are applicable to workers under the regulation of L&I (most employees in WA). The page is at: http://www.lni.wa.gov/WorkplaceRights/Wages/HoursBreaks/Breaks/ .
L&I provides a lot of useful information for workers. While you are the site, look at the other information.
L&I investigates complaints alleging violations of labor laws. Filing a complaint with L&I is free.