USairport security is second to none. Iris scans, detectors of various kinds, pat-down inspections, screenings, biometrics and finger-print check-ins are increasingly current in US international airports. If you or your baggage have been in the vicinity of explosives or you are concealing a weapon, one or a combination of these security measures will be your undoing. Or one of the army of gruff, armed US visa officers or their CCTV colleagues will likely spot you and suspect you and you’ll be escorted into a side room full of even gruffer, armed colleagues where you’ll be forced to undergo further searches and tests and get a severe grilling by questioners before ever being allowed out of the arrival hall into America real. Even the dogs you find at US airports seem to be kept on their toes and appear to be on the permanent look-out for terrorists - scampering around as though the food they are given is drenched in Red Bull and their next dinner depends on their present alertness.