A brilliant way to do that while skirting the law would be to arrange for interviewees to have a short walk from the front desk or whatever, with a chaperone an

A brilliant way to do that while skirting the law would be to arrange for interviewees to have a short walk from the front desk or whatever, with a chaperone and a person who appears to be another candidate but is actually a shill, who shares personal information (the sort that is illegal to ask about) in the manner of small talk. I wonder if/how many companies do this.