Maybe you’ve experienced this: An employee has a serious health condition, you provide the required Family and Medical Leave (FMLA) paperwork, and the certification form either comes back not fully filled out or so vague that you’re unable to figure out whether a serious health condition even exists. In these circumstances, FMLA regulations spell out exactly what steps employers can take to address these shortcomings: The employer must give the employee written notice of the missing or insufficient information and an opportunity provide it.