what is the first result? I mean, they are moving to a second opinion before even knowing the first opinion?
It's called CYA. They may not know the direct results, or what showed up, but they might have a good idea. It's just best, from a legal standpoint, to have a second one done.
Even some average, everyday, friends of mine had another one done on my friend, their sister, because they just didn't like the man she was living with, who found her body. It turned up nothing suspicious, but they were glad they did it.