The city's competitive high schools are more closely scrutinizing students' works for possible plagiarism.
The prestigious Stuyvesant High School is among more than the 150 city schools who are using cheat-checking services to ensure students are not cribbing other works, the New York Post reports.
At least a dozen of New York City's most selective high schools have contracted directly with Turnitin, a plagiarism prevention service.
Turnitin checks submitted papers against more than 17 billion web pages, 200 million student papers and leading library databases and publications, according to its website. It charges schools $2 per student a year.
Many other schools get plagiarism-detecting services through textbook publishers, according to the Post.
Last school year, 173 city students were suspended for "scholastic dishonesty," including plagiarism, cheating on tests and collusion on papers, spokeswoman Marge Feinberg told the Post. That was up from 146 suspensions in 2009-10 but less than the 204 in 2008-09.