Lower Merion officials hailed the decision, and said it matched the district's own findings that no one had used the now-disabled tracking software to monitor students.
"This is all good news for the students and staff of Lower Merion School District as we prepare for the start of a new school year," said Superintendent Christopher McGinley.
The announcement marked a bright spot for an elite suburban district that has endured an unusually harsh spotlight in the last year.
The webcam furor drew international attention. On Monday, the Lower Merion school board, responding to a court order, adopted new policies governing how, when, and for what reasons staff will track the take-home laptops Lower Merion issues to each of its nearly 2,300 high school students.
Lower Merion also faced a civil rights trial over allegations that its high school redistricting plan discriminated against minority students. In June, a federal judge ruled the plan was legal, but both sides are preparing for an appeal.
It was also the year the district completed its long-awaited $200 million high school building project. On Tuesday, officials opened the doors at the new Lower Merion High School, 12 months after christening a new Harriton High School.
The U.S. attorney's announcement means an end to all criminal investigations into the case. Montgomery County prosecutors and Lower Merion police had also opened inquiries, but ultimately deferred and assisted the federal case.
The FBI and U.S. Attorney's Offices rarely confirm their decisions to start or end a criminal investigation. Memeger said he did so, in part, "to close at least one part of this matter" before the school year opens.
