I’m not an attorney or at all familiar with employment laws in Illinois, so my answer is more a comment than a direct answer to the question.At the federal level, the US Equal Employment Opportunity Commmission had the following to say on the subject.[1]An employer may not ask a job applicant, for example, if he or she has a disability (or about the nature of an obvious disability). An employer also may not ask a job applicant to answer medical questions or take a medical exam before making a job offer.An employer may ask a job applicant whether they can perform the job and how they would perform the job. The law allows an employer to condition a job offer on the applicant answering certain medical questions or successfully passing a medical exam, but only if all new employees in the same job have to answer the questions or take the exam.Once a person is hired and has started work, an employer generally can only ask medical questions or require a medical exam if the employer needs medical documentation to support an employee’s request for an accommodation or if the employer has reason to believe an employee would not be able to perform a job successfully or safely because of a medical condition.There appears to be a line on exactly what type of medical related questions can or cannot be asked, but I can’t comment on permissible or forbidden questions with any authority.Footnotes[1] Pre-Employment Inquiries and Medical Questions & Examinations