Dive summary: 

• Recent AOL acquisition Adap.tv is rife with suspect inventory, say some researchers; in particular, the video ad network has major issues with bogus ad impressions generated by bots that some experts estimate to be 30 to 80% of their inventory. 
• One top exchange buyer claimed Adap.tv had 32% of its sites (about 500) flagged as suspect of being bogus, compared to 3% on most other ad networks; additionally, a web researcher found 30% of Adap.tv's traffic to be bot-driven. 
• Adap.tv CEO Amir Ashkenazi denies the claims of bots or fraudulent traffic; Ashkenazi claims Adap.tv is ahead of the industry with four full-time employees dedicated solely to weeding out questionable inventory, which resulted in a drop of 40% of their inventory from January to March of this year. 

From the article: 

"Ashkenazi walked Adweek through how Adap.tv’s buying interface for its exchange works. Buyers can select from a large number of criteria for placing ads, including demographics, individual sites, video player sizes and page locations. Buyers can also elect to choose whether ads are in-banner or in-stream, feature audio or no audio, or whether they are actually viewable or not. Yes, you can deliberately buy non-viewable ads on the exchange. And you can even choose to buy inventory that is a risk for fraud, or not."