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Is talking about why I transferred schools and how that led to my interest in law a good topic for a personal statement?

Really depends on why you transferred schools. If you just made the general jump from a big university to a smaller one or vice versa, then no, it isn't really interesting. But if you transferred to a specific school, for a specific reason, and that experience informed your decision to go to law school, then go ahead and try it.

Based solely on the information provided, maybe.