Can I Be Fired for Going to Rehab?
In short, your employer cannot legally fire you for going to rehab. You have some protections under the law.
Fair Chance Employment: What it means for you
Washington State and the City of Seattle clearly define protections in housing and employment for those with conviction and arrest records. For most jobs, you don’t have to reveal your criminal history until after an initial screening to “eliminate unqualified applicants.”