The three drugs Arkansas plans to use to execute eight inmates meet federal potency and purity requirements, according to a laboratory hired by the Arkansas Department of Correction.

Attorneys for the Arkansas attorney general's office submitted an affidavit Wednesday showing the Correction Department had hired an FDA-certified pharmaceutical testing laboratory to make sure the drugs meet federal standards for potency and purity.

The state obtained the midazolam, vecuronium bromide and potassium chloride last year.

The redacted laboratory tests were submitted with the affidavit as part of an ongoing lawsuit by several death row inmates. They say the state's execution secrecy law barring disclosure of the drugs' makers and distributors is unconstitutional. The Arkansas Supreme Court has put those executions on hold pending the resolution of the inmates' challenge.