VACAVILLE, Calif. -- A controversial new pilot program providing free condoms for California prison inmates is in its final planning stages.

The Solano State Prison is installing 10 condom distribution machines that will be stocked with 1,200 condoms a week, reported Sacramento, Calif., TV station KCRA.

The hope is that the condoms will limit the spread of sexually transmitted diseases among inmates.

"We know risk behavior is being reduced," said Mary Sylla of the Center for Health Justice. "We will eventually be reducing HIV infections by this measure."

A nonprofit group is supplying the prison with the machines and condoms, which comes out to costing a total of $60,000.

Gov. Arnold Schwarzenegger has twice vetoed legislation that would have set up a statewide condom distribution, but last fall the governor ordered the Department of Corrections to conduct a one-year trial.

A union representing prison guard supervisors is opposed to the distribution of condoms.

The union said that condoms can be used as places to hide drugs or weapons.

"They can put stuff in them and use them to throw at staff or other inmates," said Chris Gold of the Prison Supervisor's Union.

It is also technically against the law for inmates to have sex, and the state said that wouldn't change.

"Sexual activity in prisons is still illegal," said Terry Thornton of the California Corrections Department. "Inmates will be notified of that as well where the machines are located."

Smaller test programs have already been in place at county jails in Los Angeles and San Francisco, and supporters said so far there has never been a report of a condom being used as a weapon.

After the one-year trial run is complete, state officials will produce a report about whether the program was a success or not.