Recognizing Fakers
Ethnio does a few things to help you identify fake screener responses.
For intercepts, we capture the Referrer URL to show you the exact page where you the respondent saw your intercept. If a site geared towards gaming surveys or studies copied your JavaScript, you could see "EarnFreeSurveyMoney.com" or something like that as the Referrer URL. This is unusual, but it can happen especially if your incentive is large.
For screener links, we have an automatic incomplete status that is applies if a bot or human leaves out any key information.
Finally, be sure to include an open-ended question asking the respondent something that forces them to elaborate. This is the ultimate best way to spot fakers and bots.