I used to have one like that when I was hiring janitorial employees on my last job, I'm a fast walker so I would purposely show them around and if they couldn't keep up with me, they were gone.
I just interviewed a kid. He's on SSI and can only work 20 hours a week. How does that work, the government is only half committed?
Here's a million dollar idea: offer an interview test service. The potential employer logs in with their webcam and someone on the other end conducts the interview and administers some tests and you pay for the results.