John Curry: An ethics question

In the Dispatch coverage, a troubling thought crosses my mind due to a statement from Sidaway's attorney at Sidaway's sentencing:

"The companies included the cost of the meals for board members in their bill to the board, Hollenbaugh told jurors."

My question: How many other $$$ were billed to STRS (and paid by STRS) for gratuities given STRS Board members/associates by STRS vendors???

John