This bothered me a lot, so I contacted the department of health and requested the opt-out form. They emailed me back rather quickly with the form, but boy does the text of the form try to dissuade you!

"I understand that there are numerous benefits to public health in retaining residual NBS samples. Residual NBS samples are the only available opportunity for a complete population study to be conducted since there is a sample received on virtually every baby born. In addition to this, the NBS sample is sometimes the only remaining evidence available to the family from their child if their child becomes missing. The main benefits to NBS sample storage are: • Quality assurance and improvement for the NBS laboratory. • Research for new technologies and for detecting new disorders. • Research for new treatments and cures for major childhood diseases. • Population incidence research on disorders and environmental contaminant exposures. • Parents can recall the specimens to help determine the cause of an unexplained death of their child (SIDS). • Parents can recall the specimens to aid law enforcement in identifying their missing child. "