Self-checkout annoys many grocery shoppers and causes problems that are prompting numerous major retailers to pull back on using it. But that’s not stopping the Transportation Security Administration from testing a self-service screening system at Harry Reid International Airport in Las Vegas later this month. TSA PreCheck passengers at LAS “will be the first travelers to have the option to use the new system starting in mid-March‚ when the testing begins‚” said a TSA news release. “The...