It's possible that it has been a somewhat recent change, too-- because I know that DD has had that stuff in the past, and there is little possibility that we would have: a) missed it on the label and b) gotten so lucky that low-threshold DD didn't react, either.
That would have been during the period when touching plants which had been sprayed with deer repellent gave her hives-- after a heavy rain-- and when pasta on shared lines resulted in full-body hives. So yeah, low threshold enough that this seems impossible to me.