"So if anyone can understand that, this was a helpless victim who was sexually assaulted".
In a news conference on Wednesday, Phoenix police spokesman Sgt Tommy Thompson said it was not known whether anyone had declined to give a DNA sample.
Police investigators served Hacienda Healthcare with a search warrant that demanded DNA samples from all of its male employees.
Police said the infant was not breathing when they were called into the facility, though both mother and child are now recovering in a local hospital.
The San Carlos Apache Tribe, the Native American tribe to which the woman belongs, said in a statement that she "has been in a persistent vegetative state and coma for over a decade" and gave birth "while still in a coma".
The worker said that the extent of her injuries meant she would have been unable to tell anyone that she had been attacked, or call for help after her waters broke.
In recent days police have addressed the media to give more information about the sexual assault investigation now underway, after they were alerted to the birth. "None of the staff were aware that she was pregnant until she was pretty much, giving birth".
David Leibowitz, a spokesman for Hacienda Healthcare, said Tuesday that it welcomed the action by police and had considered conducting voluntary genetic testing of its staff before company lawyers said that doing so would be illegal.
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The substance in the packages is "suspected to have been sourced from his Shepparton home" in Northern Victoria , police said. It came two days after Sydney's Argentinian consulate was partially evacuated following reports of a suspicious substance.
The now-former CEO of Hacienda HealthCare, Bill Timmons, has also stayed silent about exactly what he knew and when he knew it.
"We will continue to cooperate with Phoenix police and all other investigative agencies to uncover the facts in this deeply disturbing, but unprecedented situation", the company said in a statement, the AP reported.
"When you have a loved one committed to palliative care, when they are most vulnerable and dependent upon others, you trust their caretakers", tribal chairman Terry Rambler said. It also appears that caretakers were completely unaware of her pregnancy until she began to give birth.
Let's hope the authorities catch the perpetrator so that justice can be served.
The Hacienda intermediate care facility specialises in providing around-the-clock care for infants, children and young adults with developmental disabilities or who are "medically fragile".
He told reporters: "As a police officer for 35 years, this is a case that even shocks my conscience, to think that something like this could occur".
Alejandro Benally, Chief of the San Carlos Apache Police Department said, "At this point, this matter falls under the jurisdiction of the Phoenix Police Department".
A lawyer for the patient's family said in a statement Tuesday that the baby boy will "be well cared for", but that they are shocked and outraged by the "neglect of their daughter". In the wake of the reports, the Arizona Department of Health Services said new safety measures have been implemented. But one complaint from December 2013 outlines an allegation that a staff member made inappropriate sexual comments about four patients two months earlier. The onset of labor doesn't require a mom knowing she's going through it, says Dr. Greves.