NO ONE can do more than guess on a hypothetical. In MY county, it would be almost a sure thing to discover a warrant on a suspect attending court. But, there are always unforeseen issues.
Chances are it will be discovered. If not discovered the first time around, it will likely be discovered eventually. I have arrested many a juvenile at their hearings on other matters ... many times, they just don't show because they figure they can dodge the system forever. Well, they can't, and warrants do not go away.
- Carl