Any police officer can tell you what “reasonable suspicion” is about.
If you see a vehicle and the left tail light is out - the officer is obligated to stop the vehicle and tell the person. At the time the officer stops the driver, he will - as is normal - ask for the driver’s license and registration.
If the driver cannot produce either of those pieces of documentation - THAT IS REASONABLE SUSPICION that the person could be in the country illegally .. or the person could have stolen the vehicle - so the officer will have the dispatcher run the plates to see if the car is stolen.
When no ID can be produced - the officer is obligated to arrest the person - and charge him with being in the country illegally - and the person will be deported.
NOTICE: I did not mention the driver’s race - BECAUSE IT HAS NO BEARING ON THE ISSUE.
However, the FEDERAL GOVERNMENT - will not allow local police officers to arrest such people. This is not security - this is national suicide!!
Plates and registration are typically run BEFORE the stop, drivers license info may also come up.
Illegals like to buy a car with current tags on it, then never register or insure it in their names.
If the most recent registration shows a Germanic or Irish sounding name, and the driver cannot speak English (Or German, Irish) but only Spanish, it’s a pretty good clue what is happening.