Cleared to play pending the investigation, Latu was injected late in the second half of an atypically freewheeling interstate battle.
The contest was fiercely contested, but this was no dour interstate slog. With 25 minutes remaining, each side scored four tries as the Waratahs held a one- point lead.
Queensland scored five tries to four, and were denied another two by the Television Match Official, with Waratahs flyhalf Bernard Foley proving the difference with an eight-from-nine goalkicking performance.
Reds debutant Matt McGahan outshone opposite number Kurtley Beale with a confident showcase of skills in the first half.
Almost three years since he left the Blues, Queensland’s new fullback caught a soaring Beale bomb and showed lightning-fast hands to send winger Sefa Naivalu across for a try.