That would probably end the story very very happy and boring, either Rowling forgot about it or decided to not use it

Ugheghghhzhbsagygagsbhejb

As the reader, the only thing I want in life is the happy endingfyhgbhkeb,gg,bg5b

Makes sense 👀

They didn’t forget about it

”Since some wizards and witches could resist its effects while others could not, Veritaserum was ‘unfair and unreliable to use at a trial’, and would have been difficult to use as definitive proof of guilt or innocence.

Another problem was that the victim stated what only they believed to be true, so the victim's sanity and perception of reality were also factors in during interrogations. Therefore, while the drinker's answers were sincere, they were not necessarily true.”

-article