No one has the right to demand your film. It's called theft. Police can seize your film, but only if actually making an arrest.
http://www.krages.com/ThePhotographersRight.pdf.
Chris Jordan is my hero for his handling of this. When security guards demanded his film, he'd sheepishly reach into his pocket and hand them a 35mm roll. The guards never noticed that it couldn't have come from his 8x10 camera.
In case anyone went as far as developing his film, the rolls contained 36 exposures of his hairy ass.
Sadly, the OP won't likely get this opportunity. Harvard is not like the industrial sites where Chris was trespassing.
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