If you've ever wondered what the output from a car's black box looks like, here it is. This is from the crash of CT Lt. Governor Time Murray. I guess the data doesn't quite match his story. Hard to believe, a politician's story not aligning with the evidence.
I'm really sorry to hear about your co-worker's situation. It sounds like a severe oversight on the installation that led to a tragic outcome. Has he been in contact with legal advisors to discuss potential compensation from the installation company?