How Safe are Your Jack Stands???

I lost contact with a guy that didn't use any jack stands and got his head crushed. Lost his eye sight,some teeth,and constant headaches.He also lost his home and moved in his mom's garage behind her house.A bunch of people fixed it up for him.It was very sad but he had a wild hair terrier that wasn't trained but was very smart and helped him.It was like an angel for him.He was part of a CB group and was always on it joking and making people laugh.After I started trucking lost contact with him and heard he had passed from complications of his injuries.He had lived 6 years after his injury.