Advertisers Question the Accuracy of Human Verification Systems such as HUMAN Security, Integral Ad Science (IAS) and DoubleVerify.

The digital advertising industry faces an escalating challenge with bot traffic, as trusted verification systems—like Human Security, Integral Ad Science (IAS), and DoubleVerify—are not effectively blocking non-human traffic as promised. These platforms, which advertisers pay for pre-bid bot filtration, are failing to prevent ads from being served to malicious bots that may be slipping through the cracks. 

According to AdExchanger, “Adalytics also observed multiple major DSPs and SSPs serving ads to bots, despite claiming to use bot detection tech, including HUMAN Security, to scan 100% of impressions. The scale of potential waste reflected in the report is staggering. Adalytics analyzed source code for millions of ad impressions served to bots between 2019 and 2025.” This highlights the significant volume of ad impressions wasted on bots instead of reaching real human audiences.

Even with advanced bot detection tools like HUMAN Security, verification systems are failing to deliver, causing advertisers to question the effectiveness of MRC and TAG-accredited services. There’s growing frustration over the lack of accountability in the supply chain, especially when advertisers are investing a lot of money into “bot-free” segments, only to find that their campaigns are being contaminated with non-human traffic.