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I have seen this topic periodically in other forums, but couldn't conjure up a clear answer.

If a law school applicant gets into a law school, decides to take a year off and reapply to the same school, is this frowned upon? Would that school be more inclined to reject because of what seems to be a lack of interest? And if so, is this true even if there is a valid reason?

all you have to say is that you took time off to exploring your options (which you are), and you found that you are now more dedicated to the study of law then before.