A major Chinese education company has paid thousands of dollars in perks or cash to admissions officers at top U.S. universities to help students apply to American schools. According to eight former employees the company’s services didn’t end there. Employees engaged in practices such as writing application essays for students, altering recommendation letters and modifying grades on high school transcripts. The company’s success in gaining access to leading American colleges underscores how people on both sides of the Pacific are hungry to capitalize on Chinese students’ desire to study in the United States.

A Wall Street Journal analysis of data from more than a dozen large US public universities found that in the 2014-15 school year, the schools recorded 5.1 reports of alleged cheating for every 100 international students. They recorded one such report per 100 domestic students. Faculty and domestic students interviewed said it appears that substantial numbers of international students either don’t comprehend or don’t accept US standards of academic integrity.

The University of Iowa suspects at least 30 Chinese students of having used ringers to take their exams. The case offers a look inside a thriving underground economy of cheating services aimed at the hundreds of thousands of Chinese kids applying to and attending foreign colleges. Coaching services author essays for clients. Handle their homework. Even take their exams. All for about a $1,000 a course.

The Department of Homeland Security arrested 21 people Tuesday on charges that they had recruited thousands of students through the promise of fraudulently obtained visas. At the center of the arrests was the University of Northern New Jersey, the brainchild of federal agents who masqueraded as representatives of a for-profit university to ensnare the recruiters.

Twenty-one people have been arrested after US authorities set up a fake university to expose immigration fraud. Officials said the accused knew that the University of Northern New Jersey did not exist, but they were unaware it was a ruse run by immigration agents. The defendants acted as brokers for more than 1,000 foreigners who sought to maintain student and work visas, prosecutors said. Most foreign nationals involved in the scheme came from China and India.

In October 2015, a New York district court ruled in favor of the academic publisher Elsevier, which had accused Sci-Hub, a website that offers pirated versions of academic papers, of copyright violation. That decision allowed authorities to take down the site’s domain name, sci-hub.org. Suspending a domain name does not delete a website forever, though, it just prevents visitors from knowing where exactly to find it. It’s trivial enough to relaunch the same site under another domain, as Sci-Hub did.

Cases of scientific malpractice in Brazil increased significantly between 2009 and 2012, according to a study looking at article retraction in scientific journals. The paper looked at retracted research articles in two major Latin American and Caribbean databases. Out of 2,000 articles from around the world published in the databases between 2009 and 2014, 31 were later pulled back, including 25 articles from Brazil. The study, published in Science and Engineering Ethics, says that this could threaten the country’s growing popularity as a research partner.