selecting volunteers

The CRB have just published research saying that nine out of ten people say that anyone working or volunteering with vulnerable groups should be checked.  They say that this 'shatters the myth' that CRB checks put people off volunteering.  I've not read the full research report yet, so I don't know what their sample size was, or how they chose them.  However,  it does strike me that just because people believe checks should be in place, doesn't necessarily mean that having to be checked themselves isn't putting them off offering time.