We know that Sadducees served on the Sanhedrin and even became high priests. [Yoma 19b] They did not believe in the afterlife or the resurrection of the dead, but this does not mean their understanding in other areas was deficient. Are there any halachot that were accepted and attributed to rabbis known to be Sadducees? Specifics?
Edit: The suggested duplicate: Did the Sadducees get anything right?
asked what the Sadducees agreed with the Pharisees on. I asked what novelty did the Sadducees contribute that became part of halacha.