No matter. My best friend's older brother work at Illinois state of the police for seven years and he told me everything what's happen. I just shocked he don't use snow tires for Crown Victoria Police(right now he own Dodge Charger Police ) for snow storm. He use very cheaper tires and no problem.
I don't have snow tires and don't need. You need to learn how to control on snow. Dry roads = hold brake and high speed, heavy rain and snow = pump brake to slow down and stop.
My mom own BMW RWD and no need snow tires so no problem so far.