The Mississippi Department of Corrections is asking a state judge to rule that information on execution drugs and suppliers is confidential and exempt from the state's Public Records Act.
The motion came in its response to a lawsuit filed by lawyers for a woman who faces the death penalty for killing her husband.
Attorneys for Michelle Byrom say the state is providing no information on whether the drugs are safe and reliable or whether they are tainted, expired, counterfeited or compromised in the some way.
The agency says it has provided essentially everything requested except for the drugmaker's identity.
Byrom and her attorneys asked Hinds County Chancery Judge William Singletary to hold the agency in violation of Mississippi's public records law.