I realize that. However you brought up the Houston system in response to a comment that only discussed wifi. After bringing up the Houston system in your comment you said people concerned about privacy should "just turn wifi off." Anyone coming along and reading this thread would realistically conclude that the Houston system used WiFi and that they could avoid the Houston system's tracking by "just turning wifi off."

I thought it would be important to let others know that "just turning wifi off" would not be an effective measure against a system that uses bluetooth.