At one point, Ms. Rhee asked if his crew wanted to watch her fire a principal. “We were totally stunned,” Mr. Merrow said.

She let them set up the camera behind the principal and videotape the entire firing. “The principal seemed dazed,” said Mr. Merrow. “I’ve been reporting 35 years and never seen anything like it.”

And yet, as voracious as she is for the media spotlight, Ms. Rhee will not talk to USA Today.

At the end of March, three of the paper’s reporters — Marisol Bello, Jack Gillum and Greg Toppo — broke a story about the high rate of erasures and suspiciously high test-score gains at 41 Washington schools while Ms. Rhee was chancellor.

At some schools, they found the odds that so many answers had been changed from wrong to right randomly were 1 in 100 billion. In a fourth-grade class at Stanton Elementary, 97 percent of the erasures were from wrong to right. Districtwide, the average number of erasures for seventh graders was fewer than one per child, but for a seventh-grade class at Noyes Elementary, it was 12.7 per student. At Noyes Elementary in 2008, 84 percent of fourth graders were proficient in math, up from 22 percent in 2007.

Ms. Rhee’s reputation has rested on her schools’ test scores. Suddenly, a USA Today headline was asking, “were the gains real?” In this era of high-pressure testing, Washington has become another in a growing list of cheating scandals that has included Atlanta, Indiana, New Jersey, Pennsylvania and Texas.