Consider:
The diminishing trust in 'eye-witnesses' in light of the impact of DNA proof of innocence
after victims have served many years in jail after 'convincing' testimony by an eye-witness - mediated by improper
police procedure of confirming suspicions following an ID in a lineup....
And.....more recent indications that eye-witnesses
are unreliable....
And.....Recent research on the 'placebo' effect now that neuroimaging
shows the impact of placebos...New Yorker Dec 12 2011 p 31