The Transportation Security Administration (TSA) defended its practice of testing beverages bought in the airport, at the gate, as a long-standing practice that even applies to TSA employees.

“In a nutshell, liquid screening at gates is random and it isn’t happening at every airport every day. So other than possibly taking a few moments of your time before boarding your flight, it’s business as usual,” TSA blogger Bob Burns wrote today in response to passenger frustration about the TSA testing their drinks at the gate.