"I recently hired a new employee to work on a big new project with a pressing deadline. Her job offer was conditional on passing a medical exam. Well, the exam identified a problem. It's not life-threatening, but the treatment will require her to miss several days of work every week—it'll be impossible for her to contribute to this project on a full-time basis. Can I rescind the offer? Meeting the project deadline requires a 24/7 commitment over the next few months."