One reason is that no one seems to agree on how to properly interpret the results of the test. As with all superstitions, the specifics tend to vary according to who's telling the tale. For example, all of the following have been offered on the Internet as "the key" to interpreting the Drano test:
Bluish yellow = boy
Greenish brown = girl
Brownish = boy
No change = girl
Brown = boy
Green = girl
Black = boy
Blue = girl
Blue = boy
Green = girl
Another reason anecdotal evidence doesn't cut it here is that by and large people are only sharing their testimonials in cases where the method seemed to work. We don't have anything approaching a fair or scientific sampling, so it's entirely reasonable to conjecture that all of the positive results can be accounted for by coincidence -- the luck of the draw. -- David Emery
