A state audit has found dozens of female prison inmates were sterilized illegally.

That report shows at least one-third of the inmates who underwent sterilization procedures over the last eight years did so without giving proper consent.

Eighteen cases violated waiting period laws and in 27 procedures, there weren't doctor signatures.

"That's needed because that physician is certifying or affirming that the patient was mentally competent, that they understood what the lasting effects of the procedure would be," Margarita Fernandez with the auditor's office said. 

The closer look was requested by lawmakers after reports that nearly 150 women had been sterilized illegally.

There were allegations of forced birth control, as the women were signed up while pregnant.