If you had consented to the search, then anything he found would have been admissible in court; By not giving your consent to the search you made it so anything

If you had consented to the search, then anything he found would have been admissible in court; By not giving your consent to the search you made it so anything that was found wouldn't have held up in court. A cop only asks to search your vehicle if he doesn't already have probable cause to do so without your permission.