Addiction affects everyone to some degree. If the addiction is severe enough—and perhaps requires rehab—addiction can affect employment. The Family and Medical Leave Act (FMLA) and the Americans with Disabilities Act (ADA) are both federal laws that prohibit an employer from firing an employee for attending rehab or seeking treatment. An employer’s own policies or a union contract may also protect employees who attend rehab. However, an employer may terminate an employee for another valid reason such as: coming to work high or drunk, using on the job, increased absences from work, or decreased performance.