Mexico has a test.
We don’t.
What’s the budget of the mexican molecular biologists?
not only do we don’t, we actually educated these guys that are coming up with their own tests! (or a lot of them anyway)
It’s embarassing
There are two ways to approach this problem
1 a quick cheap and dirty test - mexico an many other countries which work most of the time and are a good indicator
2 an expensive high tech wonder test that works all the time but no one else has - US: think LCS, CVN Ford, F-35