Read the whole article to find out how to always become ‘eligible’ for the TSA Pre-Check to breeze through TSA security.
The way TSA Pre-Check works is the organizations that participate transmit travel information for passengers who opt-in to the program to the TSA. Then the TSA in a way that randomizes security determines if the passenger is or is not eligible for Pre-Check and sends that information back to the Airline. The Airline then encodes that information in a barcode that is on the boarding pass it issues.
The problem is, the passenger and flight information encoded in barcode is not encrypted in any way. Using a web site I decoded my boarding pass for my upcoming trip.