Can you be pull over with no probable cause in Cincinnati?

No "probable cause" is needed to do a traffic stop. Only reasonable suspicion, and in many states not even that. SOme states allow "spot checks' Of drivers to determine conformance with DMV regulations in re: insurance cards, vehicle registration and valid drivers licenses.

There isn't a police officer in the country that can't articulate SOME valid reason for pulling you over (i.e.: weaving in traffic - fail to signal - burned out light - etc - etc - etc).