In Ohio they do unless they have a court order. The blanket statement made was wrong.
I didn't read it as a "blanket" statement. She stated that "very often they do" [have that right]. That would seem to be true.
I have no idea about Colorado, but what is true in Ohio, or even California, are not necessarily true everywhere, of course. I didn't read Pro's statement as being a blanket statement about anything, only that very often (depending on the state) social workers can interview a child about abuse without parental permission - even without a court order.
CA recently dodged that one. We had a law that was recently interpreted - then overturned - that would effectively have granted abusive parents the right to prevent their victim children from speaking to the police or social workers without a warrant ... we dubbed it unofficially the "Pedophile's Bill of Rights" because it would effectively have protected custodial abusers. Thank goodness rational heads prevailed.