Can some human traffic be detected as Bot?

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Yes, it is possible in following situations:

The user browser has a privacy-enhancing extensions that for example blocks HTML5 Canvas or modifies the browser’s User Agent header.
Mobile users that browse your landing page in "Desktop mode", that Adscore correctly identifies as a case of User Agent spoofing.
While unlikely, there might be some minimal rate of real false positive detections, especially when the visitor makes use of a very old browser — like Internet Explorer 5 for example.