Parents trust that a 504 Plan will provide consistent support for their child every school day, regardless of who is leading the classroom. However, that consistency can quickly disappear when a substitute teacher takes over. While substitute teachers work hard to keep classes running smoothly, they often step into unfamiliar situations with limited preparation and incomplete information. Understanding why 504 Plans sometimes break down can help parents and schools work together to prevent these issues and ensure students receive the accommodations they are legally entitled to.