Just a bit of brainstorming- let me know if I overstep, or if I'm too far off base:
It looks like maybe Juno is the local, and both Tasha and Francis are comparatively new. Tasha spent most of the early part of the year at McLean, and would be 'transferring' in to start the new school year. She would definitely be the 'new kid'.
If Francis's family has a farm, they are probably on the more rural (Waltham) side of town. Werewolves frolicking at Thoreau's Walden Pond- now that is 'back to nature'. Maybe she went to school on the Waltham side last year, and was shifted in the Belmont district for "some reason".- she would be 'new' and possibly derided by the snooty Belmont kids as a hick or a redneck (even if she is just from the next town over- many of the suburbs and small towns really are that territorial, and well, kids can be jerks...).
Maybe Janice, as a relatively 'rookie' cop with local ties (No Investigate yet?) might have drawn a shift as the school 'resource officer'- not necessarily a full-time assignment, but one or two days a week... And maybe Tasha and Francis, with their less-than-traditional backgrounds, might merit a 'welcome' lecture (not necessarily a 'scared straight talk, at least not yet- I'm thinking of the initial conversation in Buffy s1 e1, with the principal). Or maybe they saw something odd, something that kids who are "used to" the town/school simply ignored, but that they, as newcomers, actually noticed...
Again, just tossing stuff around. I'll go take my time-out now...