Waivers signed by parents, releasing liability for future negligent acts committed against minor children in recreational and related settings, are generally enforced by judges in California as discussed here.
Interestingly, a clear majority of courts in other states have held that a parent may not release a minor’s prospective claim for negligence.
And when the victim is an adult family member who dies participating in an activity for which he signed a waiver, those who can bring a lawsuit on his behalf will also likely be bound by the waiver.
As discussed
their family lives for years to come. Despite the potentially devastating effects of a mild brain trauma — also known as a " concussion " — the injury seldom appears on X-Rays, CT scans, or other common imaging techniques. Without such objective proof, the wrongdoer who caused the injury invariably argues that its victim suffered no brain injury at all, and that the victim is simply making up his symptoms.
As discussed
To get answers, the victim’s attorney needs to review internal documents and interview employees and supervisors. Unfortunately, wrongdoers seldom allow their victims’ attorneys to review their internal files voluntarily. To get their cooperation, the victims’ attorney needs a

damage caused by the trauma is just too subtle. Of course, even subtle changes in brain structure can cause profound changes in brain functioning. Simply because the brain injury cannot be seen on an MRI, it doesn’t mean that it doesn’t exist.
Doctors frequently use PET scans to find changes in brain functioning in an Alzheimer’s patient or an epileptic. They less commonly use them to diagnose victims of traumatic brain injuries. This is one reason why some judges are reluctant to allow PET scans to be used in a trial of a traumatic brain injury case. These judges, however, are often more willing to allow the PET scans to be shown to the jury when the scan was ordered by the victim’s treating doctor for the purpose of diagnosis or treatment – before any lawsuit was filed.