Yale University has been subpoenaed by three federal agencies seeking information about the school’s use of research grants over the past decade. The agencies seeking information are the Defense Department, the National Science Foundation and the Department of Health and Human Services.

Earlier this year, the Office of Inspector General for Health and Human Services said that Yale inappropriately billed expenses related to a $1.7 million stem cell research grant. The audit raised questions about the amount of time Yale employees devoted to the grant, and found over $193,000 in unallowable costs incurred in connect with the grant, among other things.

The school’s president, Richard Levin, said that Yale has hired a consulting firm to upgrade their accounting system and practices.