Thanks, that promising and helpful. How do I restrict worker access by HIT type? I don't see anything in the documentation that lets me do this — negative quali

Thanks, that promising and helpful. How do I restrict worker access by HIT type? I don't see anything in the documentation that lets me do this — negative qualifications would work, but the MTurk system does not support them. In your blocking logic, do you simply show a HIT that says "please return this HIT"? I already implemented this, but I'm worried that it is bad etiquette.