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In an effort to ensure a scheduled execution for next week actually happens, Texas prison officials are providing their Virginia counterparts with the lethal drug pentobarbital, which has become increasingly difficult for corrections agencies across the country to obtain.

In 2013, Virginia performed the same favor for Texas, according to Texas prisons spokesman Jason Clark.

The disclosure was found in court documents for a prominent death penalty case in Oklahoma.

On Thursday in a federal court filing, Oklahoma inmate Richard Glossip’s lawyers said Texas is "compounding or producing pentobarbital within its department for use in executions."

Mr. Clark rejected that notion, saying the state does not have the necessary license to manufacture its own pharmaceuticals.

As the º£½Ç´óÉñ Science Monitor reported, in recent years, the supply of lethal-injection drugs has run dry:

Mr. Glossip was convicted twice for a 1997 murder and was originally scheduled to be executed in January. But his lawyer convinced the US Supreme Court to consider whether Oklahoma's use of midazolam, an experimental drug added to execution cocktails in several states after pentobarbital became more difficult to obtain, violates the 8th Amendment, which protects citizens from cruel and unusual punishment. They argued the drug can cause agonizing pain and suffering, but the Supreme Court decided 5-4 against Glossip. His lethal-injection was rescheduled for September but the Oklahoma Court of Criminal Appeals granted him a last-minute stay of execution on September 16.

In 2014, The Associated Press reported on the condition of a death row inmate after being injected with midazolam and a painkiller during an execution:

As these lethal drugs become harder to acquire, states are considering controversial measures to ensure executions carry on, including firing squads, electric chairs, and hanging.

This report contains material from the Associated Press.