Supernatural and undiscovered means of detection

I recently had a conversation with a friend that claims to be an atheist, but has strong beliefs in the supernatural. He claims there is proof ghosts exist and such.His argument is that we just have not invented the means to detect them.His favorite argument is that at one time we could not detect quarks, but now we can. I have tried to explain that a basic difference here is that quarks are something that science predicted and then were later explained in a more concrete manner. For ghosts there are no scientific predictions.
The concept of ghosts are contrary to the scientific method, because "ghost hunters" are looking for evidence that fits their idea of ghosts. He claims the EVP(electronic voice phenomena" is hard evidence of ghosts.Does anyone have any ideas of how to continue to counter this argument of his, or does anyone support his argument?P.S.
Dr. Adequate
What happened to Skepticwiki?

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Facts don\'t lie or have an agenda. Facts are just facts

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