SMS notification is illegal, and online search is also illegal. What should I do if the traffic police inform me that there is no violation?

Then leave it alone. Anyway, there is no record, and the traffic police team can't handle it. For illegal activities with uncertain vehicles, it is best to log on to the website of the Transportation Bureau where the motor vehicle is registered. You can also search for "vehicle violation" on Baidu (or directly search for the location of vehicle violation XX), and enter the inquiry system (that is, the local public security traffic police network) on 12 123 website to make an inquiry according to the location. Generally, you need to enter the license plate number or vehicle identification number (usually the frame number). Some areas still need to register, so it is very convenient to log in and inquire in the future. In addition, the owner can also call the local number 1 14 or 12580, and enter the license plate number and engine number as prompted.