My DH is an electronics design engineer.

Some time ago now he visited the US on business, and when he arrived he was asked to wait and his passport was taken away into some back room.

He got rather worried as the minutes ticked by.

Then the official came back with a huge grin and the passport had been stamped with all sorts of permits and visas, so that if he should ever decide to go there again he would have no trouble, never, ever at all getting into the US.

It did make him think that he might actually have trouble getting out.

I would not have thought that the US was all that short of people trained in electronics, but obviously they thought there was room for at least one more.

I supose they have a list of what lines of work they think are important and another one of what sorts to keep out.

Anne