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What is the question you wished to ask? In what US state did this occur?
The only thing a lawyer can do if the police officer tells a lie on the stand is to try to impeach him with his previously made testimony or trip him up on cross-examination so that the jury can see for itself that the policeman is less than truthful. In the end, however, if the police officer holds to the lie despite cross examination there's nothing more a lawyer can do. Then it's all up to the jury. It's the jury that gets to decide for itself whether a witness is credible and how much weight to give that witness's testimony. If the lawyer never challenged the officer's testimony then you'd potentially have an appealable issue based on your lawyer's ineffective assistance,
But you've apparently already appealed. What happened with that? Has it been decided yet? For what do you need another lawyer?