FRC Student Eligibility

[zzzag]

First off, I'm still slightly new here, so sorry if this is posted in the wrong place. Also, this isn't exactly highest-priority for everyone as we brainstorm for Ultimate Ascent, but...

My team is sponsored by and builds in our school. A close friend of mine attends a school in the next town over. Over the years, hanging out together, he's gotten to know many of the members of my team.

During his freshman and sophomore years, he was a member of his school's team, but quit for complicated reasons having to do with interactions with his team's leadership and their reactions to his contributions.

This year, he wants to get involved again, but as a member of my team, which we would like as well. Is there any restriction against this by FIRST and/or any precedent for this occurring?

TL;DR: Student in nearby school wants to join our team rather than his school's. Is this okay with FIRST/CD?