A Miami International Airport employee has been arrested for allegedly beating a co-worker with an expandable police baton for mocking the size of his penis, the Miami Herald reports.

A few months ago, co-workers watched as Rolando Negrin tested the airport's full-body imaging machine.

According to the newspaper, Negrin endured months of ridicule before he allegedly snapped Tuesday night and attacked a male co-worker in the airport parking lot.

He allegedly forced the co-worker to get on his knees and apologize before issuing the beating.

Negrin has been charged with aggravated battery.

The Transportation Security Administration said Negrin has been suspended and an internal inquiry has been launched.

The full-body scanning machines, which have been used in the U.S. since 2008, have sparked outcry from privacy watchdogs like the American Civil Liberties Union.

Some Canadian airports introduced the scanners in January.