He was pulled over for speeding and a non-functioning license plate light. When the officer noticed the 'georgia carry.org' bumper sticker, he asked him about firearms. The driver verbally refused to answer that question. Please note, that the state of Georgia has no law mandating firearms notification, even upon the request of an officer, without any reasonable and articulable suspicion that said person has committed a crime, is committing a crime, or will commit a crime. 4th Amendment precedent in the courts has upheld a drivers right to privacy as well as unreasonable search and seizure for simple traffic stops and the USSC has refused to create a firearms exception to the 4th Amendment.
So, refusal to answer a question that he didn't have to got him ordered out of his vehicle and patted down for weapons, which was a 4th Amendment violation.