Both the Americans with Disabilities Act (ADA) and the Family and Medical Leave Act (FMLA) protect addicted individuals from discrimination and help them get the treatment they need without losing the jobs they need to survive.
Once you enter a rehabilitation program, you’re protected by the ADA and cannot be fired for reasons related to your addiction or the treatment process, even if it causes you to miss work. This applies to all state and local government employers and private companies with 15 or more employees.