This should result in a Brady-Giglio impairment. When cops exhibit behavior (such as demonstrable lies), this conduct is supposed to be reported to the prosecutor's office. If it happens in open court, this should be a guarantee. They maintain files on cops who are Brady-Giglio impaired, and can use the information to impeach their testimony or conduct in court proceedings. In most rational departments, once a cop has this mark against him, he is essentially useless as a cop since he really can't testify to anything in court, making whatever work he did for a case irrelevant to the prosecution.

That's how it's supposed to work. But (gestures broadly at everything), here we find ourselves.