Hawai'i inmates at the Red Rock Correctional Center in Arizona have been locked down for 10 days during a top-to-bottom shakedown of the prison prompted by two recent drug overdoses of Alaska inmates, according to the Hawai'i Department of Public Safety.

About 65 Hawai'i inmates are housed at the private prison, but are kept separate from the Alaska prisoners, said Public Safety Deputy Director Tommy Johnson.

Teams provided by prison owner Corrections Corporation of America used drug dogs as part of the search of all staff, program, recreational, medical, kitchen and living areas. Investigators discovered three grams of black tar heroin and a list detailing prices within the prison for cigarettes, marijuana and other drugs, Johnson said.

The drugs were found in a part of the prison occupied by Alaska prisoners, and no Hawaii inmates were involved in any illegal drug activity, he said. Three Alaska inmates were placed in disciplinary segregation for introducing contraband.

Johnson said CCA investigators suspect the drugs were being smuggled into the 1,596-bed prison via the mail, and have tightened up on mail room procedures. The prison is expected to return to normal operations Monday.