My most recent trip to Mexico really highlighted the different approaches to flight safety. Leaving the US, I had to remove: shoes, wallet, phone and belt just to walk into the full body scanner, while the rest of my stuff went through x-ray. Arriving in Mexico we approach a small desk where the guy asks "are you bringing any cigarettes or alcohol into the country", "no", "ok push this button", *looks at lone button on the desk*, *pushes button*, a green light illuminates! HUZZAH! I later learned that it is a random system and if the light had turned Red, my bags would have been searched. Leaving Mexico, they couldn't care less. No removing of shoes or belt, no body scanner, just a simple x-ray and metal detector.