New drone technology is bringing headaches for officials charged with keeping contraband out of prisons.

Officials in Maryland say they foiled an attempt at smuggling contraband into an area prison via drone in on Saturday. 

Police have arrested two men after officers from Western Correctional Institution in Cumberland, Maryland, found their car near the state prison complex. Inside they found a drone, a handgun and contraband, including synthetic marijuana and pornography, according to The Baltimore Sun.

Thaddeus Casimir Shortz, 25, of Knoxville, Maryland and Keith Brian Russell, 29, of Silver Spring, Maryland were both arrested and additional charges are expected against an inmate who had contraband in his cell and is believed to have been working with the two men.

“Thanks to outstanding intelligence and detective work, we were able to keep out contraband that fuels violence and threatens the safety of the public, our employees, and the inmates,” said Stephen T. Moyer, secretary of the Maryland Department of Public Safety and Correctional Services. 

Drone allegedly used to deliver drugs to inmates in Maryland prison. 2 pilots busted @ABC7News for more pic.twitter.com/lfmjnxyz8w

— Brad Bell (@ABC7Brad) August 24, 2015

The thwarted drone delivery in Maryland represents the advent of a new prison smuggling chain and the subsequent fight against it.

The Columbus, Ohio Dispatch reported a “high-tech flyby” at the Mansfield Correctional Facility earlier this month when a drone dropped a package containing tobacco, marijuana for 70 joints and a enough heroin for 100 doses.

The drop caused a prison-yard brawl that had to be quelled with pepper spray, and that wasn’t the first time a drone had visited the prison of 2,700 inmates.

Unlike a recent case in Oklahoma where three men were arrested after trying to fling parcels containing drugs and cell phones over a prison fence, drones can fly in undetected, drop a payload and disappear with no one to arrest and no obvious trail to follow.

Drone flights can also go unnoticed or unrecorded on video surveillance, their only evidence the cargo they leave behind. Officials in Ohio didn’t initially see the delivery drone on surveillance cameras, only realizing a problem when the fight broke out. 

On April 21, 2015 South Carolina prison officials saw a drone’s blinking lights in the early morning hours, then found a package of tobacco, marijuana and cellphone tangled in nearby power lines, according to The New York Times.

However, the future of drone deterrents is hard to know, as prison personnel are hesitant to comment on what they say is a security issue. In Oklahoma, officials said they’re aware of drone deliveries in other states but said they have had no such incidents, and refused to comment further.

When it comes to drones, no fence is high enough.

The Cumberland, Maryland Times-News contributed to this report.