There is no need to track them if you don't let them into the country in the first place. That is easily done by denying anyone with a visa issued in any of the banned countries or anyone that boarded a flight in those countries - all easily done by looking at their passport
Thee people will do and say anything to not geographically contain the disease. Look at the new TB and virus cases brought over the border by kids from central america.
No uproar no action by the congress, no one cares except a few of us.