"The Postal Service is so concerned about rising drug costs and DOL’s inaction that, in October 2015, it requested an adjustment and withheld $68.6 million in payment for its workers’ compensation chargeback bill. According to Postal Service officials, the $68.6 million represented compound drug cost increases potentially attributable to fraud and abuse that OWCP had a duty to prevent. In December 2015, the DOL denied the Postal Service’s request. While Postal Service officials disagreed with the DOL’s determination, they paid the outstanding $68.6 million."

quoted from https://www.uspsoig.gov/document/management-advisory-workers%E2%80%99-compensation-compound-drug-costs