If I am pulled over without probable cause, how do I build my defense?

Question Details: I was driving down the road and was pulled over by local police. The officer said she was riding behind me and ran my plates and found that the plates were actually expired. When she got my SSN she discovered my license was suspended. She wrote me a ticket for Driving under a suspended license since the car wasn't in my name. The vehicle I was driving had stickers on the license plate that indicated that the car was registered until 2010. I wasn't charged with anything but suspended license and my question is was this a legal stop? I don't feel the officer had probable cause to pull meover

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