56 Ill. Adm. Code 5220.800
Speak English Only Rules
Section 5220
Section 5220.800 Speak
English Only Rules
a) An employer may not have a rule requiring that employees speak
only in English at all or at certain times where the rule has the purpose or
effect of discriminating against individuals on the basis of national origin.
It is a defense to an allegation that a "speak English" rule has a
disparate impact on a particular national origin group to show that the rule is
justified by business necessity.
b) It is common for an individual whose primary language is not
English to inadvertently change from speaking English to speaking his or her
primary language. Therefore, if an employer believes it has a business
necessity for a speak-English-only rule at certain times, the employer should
inform its employees of the general circumstances when speaking only in English
is required and of the consequences of violating the rule. If an employer
fails to effectively notify its employees of the rule and makes an adverse
employment decision against an individual based on a violation of the rule, the
Human Rights Commission ("the Commission") and the Department will
consider the employer's application of the rule as evidence of discrimination
on the basis of national origin.