Paddy...

There HAVE been studies done on the rates of injury with relation to mandated helmet use. A few states in the west enacted laws, repealed them, then reenacted them after head injury numbers climbed again with the drop in helmet use. I don't have citations on hand, but found that information when I was doing research on human behavior related to the use of safety devices. I posted lots of links in a different thread... I'll dig that up and link it here.

MNS