Federal Law and Alameda County Health Officer Order require masks be properly worn over your nose and mouth in all areas at OAK with few exceptions noted in Transportation Security Administration (TSA) Security Directive (SD) 1542-21-01, Sections D – F. Refusing to wear a mask at OAK is a violation of Federal Law and will result in removal from and denial of re-entry to the Airport. Individuals may be subject to penalties for non-compliance under Federal Law. Thank you for doing your part to help minimize the spread of COVID-19, and thank you for flying OAK!