Put a mark on the swab, put a rubber band around the mark on the swab and say it has to go back that far. Have a test for adults and another for children. But

Put a mark on the swab, put a rubber band around the mark on the swab and say it has to go back that far. Have a test for adults and another for children. But, the video from the actual labcorp website someone else posted shows it does not actually have to go very deep.