California destroys the newborn's blood sample when the parents ask [0], but their privacy policy says that sometimes they don't do it [1]:
> You have a right to ask the Newborn Screening Program not to use or share your or your newborn’s information and/or specimen in the ways listed in this notice. However, we may not be able to comply with your request.
> You have a right to ask the Newborn Screening Program not to use or share your or your newborn’s information and/or specimen in the ways listed in this notice. However, we may not be able to comply with your request.
[0] https://www.cdph.ca.gov/Programs/CFH/DGDS/Pages/nbs/MyBabysB...
[1] https://www.cdph.ca.gov/Programs/CFH/DGDS/Pages/nbs/nbsnpp.a...