You may or may not be able to get the case thrown out because of the bad affidavit.  The errors, by themselves, will not result in the dismissal of an offense that was observed "on view" by an officer... which most evading offenses are. However, the affidavit can help convice a jury that the officer lacks credibitily, and therefore, your son should not be convicted of the offense. You can request a dash cam... but... if you can disprove the affidavit without the dash cam... it may be more strategic to do so.  Let me explain.... the camera usually shows exactly what happened and did not happen.  Even though the affidavit had errors.... if the dash cam clearly shows that your relative committed an offense... then a jury isn't really going to care what the affidavit says or didn't say. On the flip side... if you don't request the video and it's not preserved (which happens more disturbingly than it should), then the only evidence is the officer's word.  If the affidavit demonstrates that the officer lied, was mistaken, or otherwise recited impossible facts... then a jury will evaluate whether or not the offense occured.... and your relative will have a better chance of defeating the charge. So... before considering getting the video....just know that you may be preserving the one piece of evidence that help or hurt his case.