Subject: quantum measurement problem follow up

Regarding the response by Ken Wharton here:
http://www.madsci.org/posts/archives/may2000/957364955.Ph.r.html 

What I'm dying to know is: are there experiments which PROVE that a
consciousness is not necessary to collapse the wave function?  For example, put
a photon detector on the 2-slit experiment, but cloak in such a way that no one
can read the results.

Or is it considered so obvious that no one has done the experiment?

I have read many books on the topic and never once read of such an experiment.

Re: quantum measurement problem follow up