The report on agency rebate practices is the result of a monthslong investigation by K2 Intelligence and Ebiquity and is likely to bring into focus how advertisers conduct audits of their agency partners.

Audits, of course, have been standard practice for decades, designed to give clients deeper insight into how effectively their agencies and other partners are spending their media budgets.

But with controversial practices like media arbitrage, rebates and so-called “double dipping” increasingly making headlines in the past few years, marketers are eager to gain back control of their media spend. And they’re looking to audits as not just a way to benchmark their agencies, but to uncover what they may be hiding.

Read the full AdExchanger article here.