A former employee of the Department of Education plead guilty to accepting a gratuity. In a DOJ Press Release (here) of the US Attorney for the District of Columbia it states:

"[The individual] admitted that the company’s president had told him that he would be able to pay [him] for services he had provided over the past couple of years if the company received the contract with the California grantee. The company’s president subsequently paid him $10,000 in cash in two separate installments between January and May 2005 for services [he] had provided to the company over the past 25 years. The installments corresponded to the installment payments the company had received pursuant to its contract with the grantee."

(esp)