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OKLAHOMA CITY -An inmate who was found with a loaded gun inside the Oklahoma County Jail is now facing additional charges.

Oklahoma County officials were in for a big surprise when an inmate was found with a loaded firearm inside the jail, but how he managed to smuggle it in, is what has lawmen taking a second look.

Thanks to another inmate, they were able to get to the “bottom” of it.

So how did this man manage to smuggle a loaded weapon into jail?

Oklahoma County Sheriff John Whetsel said, “In this case, authorities said the weapon got past a body search. A pat-down will not reveal a Derringer firearm that is secreted in a body cavity.”

Authorities said because so many people were booked into jail over the weekend, Mark Gregory Valadez never went through a metal detector before being put into a jail cell with his “concealed” weapon.

Sheriff Whetsel said Valadez began bragging about the gun to other inmates and that’s when things got a bit more thorough.

“We had our officers go up and do a search and they found a little small Derringer with one small round inside,” Sheriff Whetsel said.

A small round inside the gun, inside Valadez.

He was originally arrested on a city violation that is now a felony count of possession of contraband in a penal institution… and a trip to the hospital.

“Because of complaints and concerns from Mr. Valadez, we had to take him to the hospital on complaints that he was actually found to be impacted do to the weapon,” Sheriff Whetsel said.

As for the jail staff member who did not put Valadez through the metal detector, authorities are checking surveillance video to find the employee and deal with them accordingly.

It is a violation of jail policy.

Valadez is now facing complaints of possession of contraband in a penal institution, possession of a firearm after a former felony conviction, transporting stolen property into the state and receiving and concealing stolen property.

Investigators say the handgun found inside Valadez was stolen from a home in Wichita, Kansas.