Originally Posted by
HDQDD
Smart companies use barcodes that change periodically (i.e. every minute) to prevent exactly this type of behavior (i.et. taking a pic and sending to someone else). Heck, even Costco does this...and their app is pretty weak.
Or, as Costco also does, have a picture of you in the app. So as your BP is shown on the screen, swipe left or right at boarding to let your picture be shown.