Nys Warrants

Are there any circumstances under which a trooper won’t run a Driver’s License check?

I had an interesting conversation with a buddy of mine who is visiting from SC. Before he left, he was ticketed for DUI. Not that this makes a difference, but he had a clean record and has never been ticketed with DUI. He says he blew right at .08 (not sure if calibration issues would have come into play here) on the test. Anyways, he never went for his court date on Sept. 19, 2007 and he is sure that his license is suspended and a warrant was issued for his arrest. The other night he was driving home late (not drunk he works a late shift at a job) and was pulled over by NYS troopers. They did a Field Sobriety Test on him and let him go. What he is wondering and frankly so am I, is how he was let go? Wouldn’t the officers be compelled to run a check, especially on somebody pulled over on suspicion of DUI? Is there any odd way he could have slipped through the system in SC? Also, he was hired at a job that does background checks and nothing came up there either.

The information hasn’t been entered into the computer yet.
Edit. Both states are members of the DLC. His license will be suspended, and most likely a warrant for failure to appear will be issued.