PITTSBURGH—Eight of 15 Chinese citizens indicted in a conspiracy to take college entrance exams on behalf of others or pay to have their tests taken so they could obtain student visas pleaded not guilty before a federal magistrate Wednesday.

Federal prosecutors in Pittsburgh allege they scammed tests run by Educational Testing Service and the College Board—such as the Scholastic Aptitude Test, or SAT—for more than $5,000 per exam.

The alleged scheme involves tests administered in Pittsburgh and its suburbs since 2011. Some of the defendants eventually enrolled in out-of-state schools, though investigators and defense lawyers have refused to supply specifics.

Two students arraigned Wednesday were enrolled at Virginia Tech and a third is accused of having someone else take a test whose results were sent to Northeastern University.

"Mistakes were clearly made and they're probably going to end up paying for them," said defense lawyer Lyle Dresbold, who represents Yue Zou, 20, of Blacksburg, Va.

Zou and her boyfriend and co-defendant, Yudong Zhang, 21, were listed as students Wednesday on Virginia Tech's website. Ms. Zou is studying finance and Mr. Zhang general engineering at the school, where officials didn't immediately comment on their status or the test-related charges.

Mr. Zhang allegedly sent a photocopy of Ms. Zou's passport to a Pittsburgh man, Han Tong, 24, who's identified as a test-taker, before another woman arraigned Wednesday, Yunlin Sun, 24, of Berlin, Pa., took SAT and English language tests while posing as Ms. Zou, according to the indictment.

"These aren't bad people," Mr. Dresbold said. "They just wanted to get an education. They just wanted to get ahead."

But U.S. Attorney David Hickton said the Pittsburgh investigation is just part of a continuing investigation spurred, in part, by concerns that people from China and other Asian countries have been impersonating others, or otherwise cheating on the tests.

That is a federal issue, Mr. Hickton said, "Because if that student status is obtained fraudulently, then that [student] visa is obtained fraudulently."

"Nowhere is it accepted that you can cheat or lie your way into a college, and that's what this case is about," Hickton said.

Lawyers for Mr. Tong, considered a central figure in the charges filed so far, and several other defendants declined to comment. Robert Mielnicki, the lawyer for Ms. Sun, said she "contests the allegations" but declined to elaborate.

The only other lawyer who spoke was Gary Gerson, who represents Gong Zhang, 23, also of Pittsburgh. He allegedly took an English fluency exam in April 2013 for another person not named in the indictment.

Mr. Gerson said his client is a "naive" young man who received only "minimal" reward for his actions. "He tried to help a friend out and didn't realize what he was getting into," Mr. Gerson said.

Two others scheduled for arraignments Wednesday had their court appearances postponed, two others have yet to be scheduled for arraignments and three others charged have yet to be identified as their names have been redacted in the mail and wire fraud indictment announced late last month.

The others arraigned were:

—Biyuan Li, 25, of Boston, who allegedly paid $5,990 to have an unspecified test taken for him;

—Siyuan Zhao, 24, of Revere, Mass., who allegedly had Mr. Tong take an English fluency test whose results were sent to Northeastern University;

—Songling Peng, 19, of Watertown, Wis., who allegedly sent an image of his real passport over a Chinese chat network so it could be used to make a fake one, and wired $5,600 to an unspecified New York bank account for a test taken in his name.

Copyright 2015 Associated Press

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