The Gadsden Independent School District) took the mock bomb to a school on Monday, district spokesman Louis Villalobos told the Las Cruces Sun-News ( http://bit.ly/1g7ObwL).
The principal contacted authorities after learning of the mock bomb, which consisted of an alarm clock fastened to a box containing several sticks of fake dynamite. The school was evacuated while an FBI team inspected and removed the mock explosive device.
Villabobos said the employee is an instructional assistant, a former law enforcement officer and a member of the school's emergency response team.
"Apparently this individual took it upon himself to create a (fake) explosive device apparently for some sort of training purpose but there's no training scheduled," Villalobos said.
The school district is headquartered in Sunland Park, which located south of Las Cruces and north of El Paso, Texas.
Villalobos, who did not specify how the worker would be disciplined, did not immediately return a call Tuesday.
Kelly Jameson, a spokeswoman for the Dona Ana County Sheriff's Office said the worker will not be prosecuted because there was no intent to break a law or incite a disturbance at the school.
The worker had good intentions and now knows he shouldn't have taken the device to school without arranging it in advance, Jameson said.
"You just can't do things like at a school these days."