My partner and I went to a YVR in Nov 2001 on OFFICIAL U.S. GOVERNMENT TRAVEL to give a talk at a INTERNATIONAL meeting that was being held in YVR. We were detained at the border for a good 15 minutes while they poured over our Travel orders, meeting agenda and our passports. It was really too much.
We should have just told them we were up for the day to go shopping. It would have been faster.
As for job titles, I just put my boring old one down and am happy to show them proof.