UNIONDALE, N.Y. — Brother Kenneth Hoagland had heard all the stories about prom-night debauchery at his Long Island high school: Students putting down $10,000 to rent a party house in the Hamptons. Preprom cocktail parties followed by a trip to the dance in a liquor-loaded limo. Fathers chartering a boat for their children's late-night "booze cruise."

Enough was enough, Hoagland said. So the principal of Kellenberg Memorial High School canceled the spring prom in a 2,000-word letter to parents this fall.

"It is not primarily the sex/booze/drugs that surround this event, as problematic as they might be; it is rather the flaunting of affluence, assuming exaggerated expenses, a pursuit of vanity for vanity's sake — in a word, financial decadence," Hoagland said, fed up with what he called the "bacchanalian aspects."

"Each year it gets worse — becomes more exaggerated, more expensive, more emotionally traumatic," he added. "We are withdrawing from the battle and allowing the parents full responsibility. [Kellenberg] is willing to sponsor a prom, but not an orgy."

The move brought a mixed, albeit passionate, reaction from students and parents at the Roman Catholic school, which is owned by the Society of Mary (Marianists), a religious order of priests and brothers.

"I don't think it's fair, obviously, that they canceled prom," said senior Alyssa Johnson of Westbury. "There are problems with the prom, but I don't think their reasons or the actions they took solved anything."

But Margaret Cameron, parent of a Kellenberg student, said: "The school has excellent values. We send our children here because we support the values and the administration of the school, and I totally back everything they do."

Hoagland began talking about the future of the prom last spring after 46 Kellenberg seniors made a $10,000 down payment on a $20,000 rental in the Hamptons for a post-prom party. When school officials found out, they forced the students to cancel the deal; the kids got their money back and the prom went on as planned.

But some parents rented a Hamptons house anyway, Hoagland said.

Amy Best, an associate professor of sociology and anthropology at George Mason University in Virginia and the author of "Prom Night: Youth, Schools and Popular Culture," said this is the first time she has heard of a school canceling the prom for such reasons.

"A lot of people have lamented the growing consumption that surrounds the prom," she said, noting it is not uncommon for students to spend $1,000 on the dance and surrounding folderol: expensive dresses, tuxedo rentals, flowers, limousines, pre- and post-prom parties.

Best pinned some of the blame for the burgeoning costs on parents, who often are willing to open their wallets for whatever their child demands. "It is a huge misperception that the kids themselves are totally driving this," she said.

Chris Laine, a senior from Rockville Centre, said the cancellation was "unfortunate, but you can't really argue with the facts they present. ... It's turned into something it wasn't originally intended to be."