Protein powder in carry-on tripped the scanner yesterday, then triggered the swab wipe and required a"specialist"to examine. He didn't show up for 30 minutes, so we nearly missed our flight. We offered to abandon the powder, which was not acceptable to the front line people, but was insisted by the specialist.

The other one of us also had protein, without incident.

Was this just bad luck? How to prevent? Or just don't carry it?