The Oklahoma State Penitentiary conducted an institutional shakedown "Search of Offender Housing" on Wednesday.
Officials at the prison in McAlester said the process began early Wednesday morning and ended just before noon.
The Oklahoma State Penitentiary is the state's maximum-security institution and home to Oklahoma's Death Row.
Assistant Warden Terry Crenshaw says the shakedown gave the prison the opportunity to search many housing areas at the same time.
He said by doing this, it prevents inmates from removing or relocating contraband before officers can search all the housing units.
Crenshaw said officers did not find any drugs, but did find two cell phones, which are illegal and three items of contraband which could have been used as weapons.