Which schools require a letter of rec from ALL research supervisors?

[Lifeman]

I did a 1 quarter research internship two years ago. It would be nice to put it on my Work/Activities, but I don't think it would be a strong letter. Just wondering which schools require a letter of rec from ALL research supervisors, so I can decide whether or not include the activity. Thanks.

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[Espadaleader]

Schools don't require research from all research mentors. You should have at least one strong one though.

 

[Lifeman]

Schools don't require research from all research mentors. You should have at least one strong one though.

Well I know for one, Harvard does. Look at the third bullet here: http://hms.harvard.edu/departments/admissions/admissions-faqs#Letters
I was wondering if any other schools do.

 

[23premes]

Well I know for one, Harvard does. Look at the third bullet here: http://hms.harvard.edu/departments/admissions/admissions-faqs#Letters
I was wondering if any other schools do.

What if my research supervisor has passed away!? That's a little ridiculous to require those letters if one is not a PhD/MD.