I have been there several times. Health questionaire where i was one on one with the interviewer. Then ive also been in a mock jury where their are several people in the discussion. At the end they hand you an envelope with cash.
It's a reputable company that you can sign up for and intermittenly do local surveys about random things like radio station music, or fast food, and insurance, gaming, etc... if you fit the parameters of the specific survey. Pays cash at the end. Usually 90 min to 2 hours. Sometimes theres all say mock trials too.
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