I would begin to be convinced that a medium had psychic powers
if they could give accurate answers to questions such as
"Where did I first live?"
"What was my first Job?"
"What is the first name of the man who fixed my computer last week?"
Instead, they dig around with vagueties until they find something you respond to,
then home in on that with further vagueties until you make a further positive response.
Any blind alleys are immediately dropped.
Fairly soon they are telling you something that they "could not possibly have known beforehand".
They didn't know it beforehand, you told them through your responses.
The other thing they do is tell you things that could apply to anyone.
Total frauds, the whole lot of them.