Since the laptop is obvious, it may be awkward for the student to be the only one with an electronic device. We suggest handling inquiries individually, with the explanation that exceptions to class policy are handled on a case by case basis and in many cases are related to an ADA accommodation. This statement could be included in your syllabus after your "no electronics" policy. You could also announce in class that if anyone has a good reason for an exception to course policy they should meet with you to discuss it.