It would probably be an even better option to verify that anyone someone is considering leaving negative trust that they are in fact a scammer
I don't think DT member tagged someone without any issue although there might be some exceptions.
(or someone who will likely scam in the future).
A proverb going that
Black will take no other hue.They shouldnt leave a negative rating just because lauda says the are a scammer without evidence.
Most of those have enough reference link. Without reference link, tagging again will look awkward. In this case, DT can check the ref link and tag.