It is more along the lines "I am inclined to believe you but you are not proof in court". The show has had a good run for 8 years. There is just so much that can be done with the same cast. Every episode pretty much has the same plot, it is just a matter of figuring out the "twist" they try to throw in, remember she is not always shown the truth by the spirits and can be wrong just because they show her something out of context.