Might be easier to look at the back of sockets. Black to
copper screw, white to silver screw. Some where, a socket is
wired backwards.

--
Christopher A. Young
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"RogerT"
wrote in message
...

If I had a situation like that (I don't), would one way to
try to figure out
where the wires got switched be to use a continuity checker?

In other words, turn off all of the power and then use a
continuity checker
with a long wire and alligator clip attached, and try to
trace which wire
from the first box has continuity to which wire in the
second box, etc.