Slightly late on joining the thread but just to throw a little light on the screening process in Dubai for ALL US bound aircraft:
All hold baggage, irrespective of airline, has to go through the highest level of screening. This is what is referred to as Level 5 and includes each piece having projected images from multiple angles.
Prior to the airport having this category of screening machine, bags were pushed through the baggage system and screened normally. They were loaded on to trolleys and then transferred to a mobile screening machine where they were screened once again. A very laborious and time consuming process. Also, the TSA visited quite a few times to audit how this process was carried out. Evidently screening for both EK and the US carriers (DL/UA when they operated from DXB) was up to the desired standard.
The screening is also carried out by the Police and no other agency, as is the case in many other airports.
The automated baggage system in DXB is world class in terms of tracking, screen images etc. so this should be the least of the worry.
At the gates, EK security check both passengers and baggage as they arrive too.
This whole thing smacks of a ruse to screw over the ME3 and just to make life difficult and inconvenience the passengers. Very childish indeed.