It comes after some students got their hands on alcohol and ended up so drunk they had to go to the hospital.
Friday evening, the biggest football game of the year for Clarkstown South High School kicked off: a showdown against rival Clarkstown North.
But there's another reason for bad blood between the schools, a crackdown of sorts on post-homecoming activities.
Last weekend a number of Clarkstown North students were hospitalized with alcohol poisoning during an unsanctioned and unsupervised bus trip into Manhattan.
District officials are looking to avoid a repeat since dozens of South High students are planning their own bus trip into the city following a school dance.
The principal has sent a recorded message to all parents reminding them of the likelihood of illegal alcohol and/or drug use.
The district attorney is investigating whether parents supplied alcohol to the teens involved in last week's incident, so the message this week at South was directed to adults.
To discourage drinking before the trip, students will be not be allowed to leave Saturday's dance early.
There will be extra security and scrutiny all in the name of safety.