Post MMI

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Effective to what end? to offer gratitude for the opportunity to interview? In that sense yes. However, 90%+ of the time within 24 hours of interview/MMI, all reports/ evaluations have been filed and your letter wont have any impact on an adcom decision.

Not the case at my school.
Seeing a thank you letter is nice, but ultimately doesn't really have any impact.
 
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