NJ.com: Everything Jersey
important things to note
The law prohibits mandated or school led prayer. In this case the students took it upon themselves to pray. The coach never mandated prayer or supported it, peer led prayer is protected under the 1st amendment in schools. Being of a like mind the coach joined in, this is what the ACLU took a problem with. They claim by law the coach cannot join in to the students prayers
my personal thought
How hypocritical is this? It's safe to say that if this coach was speaking about anti Jewish topics, pro Muslim speech, or even Child Abuse (the ACLU is a well documented supporter of NAMBLA) the ACLU would be the first to run to his protection.
while the coach has no business leading prayer before the game, the students have every right to do it if they want to and the coach should be free to join in or leave the room