I have visited nadi astrologer 2 years back and I experienced it to be all false. The information they gather by asking questions is sufficient to know the name or date of birth etc. From that thet make a general horoscope and from horoscope, they give the predictions.

During the questions, they gather all kind of information in such a way that they are searching the correct leave but they are collecting all the affirmative information. If any reading from leaves is not true, then they will say that this is not your leave and move on to other leaves. In the mean time, they remembers all the affirmative infomation which is considered as a base for the prediction. That means what information you provide them, is only repeated by them.