Yolanda Toole has filed legal papers asking to preserve the evidence related to her son's death at Burlington County Special Services School in Westampton.
Sixteen-year-old Isaiah Toole drowned Nov. 1 during an aquatics class.
In the papers, the mother says the boy was left unsupervised.
The legal filing was first reported by The Courier-Post of Cherry Hill.
The school superintendent did not immediately return a call Tuesday morning.
The Burlington County Prosecutor's Office has called the death accidental.