The ADA and Chapter 151B both prohibit employment discrimination against individuals with disabilities. Mail Fill out and send the paper ADA Complaint Form.A charge of discrimination can be completed through our online system after you submit an online inquiry and we interview you. Within 300 days of the act of discrimination, file a complaint with either the Equal Employment. Learn how to prove disability discrimination and protect your rights with help from our Boston disability discrimination lawyers. You must file your claim of discrimination with the MCAD within 300 days of the discriminatory conduct or practice you are complaining about. Charges of employment discrimination on the basis of disability may be filed at any U.S. Equal Employment Opportunity Commission field office. What Type Of Conduct Is Prohibited? Employment disability discrimination is prohibited under Massachusetts and federal laws. The Americans With Disabilities Act ("ADA") serves as a landmark act in protecting those with disabilities in the workplace.