Gentlemen
What makes you think they won't.
There are two problems with a martial law in America.
1. We travel so far for necessary things that if denied would effect the entire economy.
2. We live so far apart it would take too many soldiers/cops/agents to enforce.
To have this change they will need to make travel unpopular. This is why the teams.
However, and wait for this to hit, if you just get an RFID ID chip you will simply be able to walk by the stations at local banks, hospitals, parking garages, grocery stores, etc with a wave of the hand it has been embedded into. Embedded so it can't get (excuse the pun) into the wrong hands.
Enter the mark of the beast.