Very soon the summer travel season will be upon us and, with it, ever longer lines at Transportation Security Agency passenger identification and screening checkpoints.

Most people understand why physically and mechanically screening passengers and baggage is necessary, given that last year TSA uncovered nearly 7,000 guns on persons or in the checked baggage, with more than 90% of the weapons loaded. But with only one gun found per 8 million screened passengers, it’s clear the bigger reason for TSA’s long lines is identification checks.