Although this is not clear, I assume you work with the mentally disabled? It is a known risk of such employment that you have to deal with combative, "clients." Your options are to find other employment and file a workers compensation claim if you sustain an injury. If you work in a business that has the discretion regarding their "clients" an employer does have a duty to protect you from such hazards. The duty is different if the reason this person is being combative is because of your sex, color, national origin, race, disability, age, or religion. In that case you would have a hostile work environment claim. If not, you may be able to sue your employer outside of the workers compensation arena if it is foreseeable that this client could intentionally cause harm. In both cases you need to make a specific complaint to the employer and if the conduct engaged in arises to criminal assault, report it to the police. I would make the police report 1st and then they complaint to the employer 2nd. That way you also have whistleblower protection.
Answered on May 14th, 2013 at 4:53 PM