When a police officer runs your license through the computer what information does he have access to if your wanted for question?

License status, driver record, warrants and concealed weapon permits. Other information can be readily located (if the officer asks) using the information on the driver license.

This does vary state to state and maybe even jurisdiction to jurisdiction. Not all agencies show the same info when running plates. Some show very little information and some have a wealth of information. I do agree that any agency can get the above information, but not all of it is necessarily coming through just by running the plates. (might take an extra call or two!)