For double blinds, there are no logical reasons.

Double Blind Comparative Trial of Nomifensin and Desipramine in Depression.

Following McMorrow's departure as keyboardist, the band released their first full album Eyes to the Sun, on Double Blind Music in 2008.

Unfortunately, his assessments of these, lacking significance tests, double blinds or other accepted evaluation measures, are inconclusive: "No follow-up information is available"; "improvements in classroom behavior resulted but not in academic performance or on standardized tests"; "little information is available on whether . . . effects persist or are soon forgotten."

For Freudian psychotherapy had double binds, but no double blinds: its devotees did not take the elementary precaution of comparing parents of schizophrenics or autistic children with other parents, let alone test whether "blind" observers, ignorant of which group individuals belonged to, could correctly assign them on the basis of objective data.