I wonder if it's a case like domestic terminal -> international terminal without any post-security options to move between the two.

I do know that flying _back_ to the US on my last few international flights, there was a second security checkpoint I had to go through. Very silly. I had filled my water bottle at a fountain at the gate and then had to empty it right out 5 minutes later.

Whenever you transfer at different security zones, you have to go through security again. So I fly threw Japan a lot, and always have to recheck (but they are pretty fast). I'm connecting through Moscow next week to get to Europe, and I'm dreading Russian security a bit (it's pretty fast, they don't actually check much, but very disorganized).

I think the theory with this is many foreign countries don't do sufficient checks.

Based on travelling in south America, south East Asia etc, this is sometimes correct.

You have to go through security again for international flights that connect to a domestic flight, but not usually (ever?) if you've passed TSA within the US and are connecting to leave the country. That's true at every airport in the US, not just Miami.

> You have to go through security again for international flights that connect to a domestic flight, but not usually (ever?) if you've passed TSA within the US and are connecting to leave the country.

There are lots of times when with domestic -> international flights (or even domestic -> domestic, in some cases) there would be terminal transfers required that would leave the secured zone and thus require passing through security again incidentally, even without a specific policy.

Several airports where I know this was an issue have been redesigned to alleviate this, but I'm sure there are some where it is still an issue.