<p>I am pretty sure that top schools that compete with each other do cross check early app lists (at least they say that they do), and someone doing this could have their admission rescinded to both. They also might have some friends in hs who could take it upon themselves to notify the colleges…</p>
<p>Although I am not sure how the students can pull this off, since parents and school counselors are supposed to sign the early app agreement as well. A counselor that allows it really jeopardizes reputation of the school, which can hurt their students for years to come…</p>