Where is the fortune telling more accurate?

I have some questions about this problem. Although I shouldn't be superstitious, every time I ask such a blind fortune teller to report a dead person's birthday, I will always be scolded. Because it's amazing, they can always know that this person has passed away when they pinch it, so I admire it and it's hard to understand, but it's hard to say anything else. I count every time and say that I can be an official. How nice, but so far I haven't found any signs, which is really distressing.