Some Facebook moderators are asked to sign a disclaimer before starting work, accepting that the content seen in their jobs could lead to poor mental health and

Some Facebook moderators are asked to sign a disclaimer before starting work, accepting that the content seen in their jobs could lead to poor mental health and PTSD (Post Traumatic Stress Disorder). An example of the contract, read out in the committee said: “I understand that exposure to this content may give me post traumatic stress disorder. "I will engage in a mandatory wellness coaching session but I understand that those are not conditions and may not be sufficient to prevent my contracting PTSD.” Does this kind of waiver exist for physical harm? Something like "as a factory worker, I will follow safety protocols but I understand that they may not be sufficient to prevent loss of life or limb.”