When a Cancer Therapy Puts Others at Risk

Thyroid Cancer is treated by swallowing radioactive iodine which kills the malignant cells. Patients are radioactive afterwards and are potentially dangerous to others that they associate with.

In 1997, the Nuclear Regulatory Commission dropped a requirement that such patients be quarantined in the hospital. Instead, patients can be released right after their treatment, when they are at their most radioactive.

I dont understand how the government can get away with this. Its the Governments responsibility to be  overlooking such problems. In the preamble of the Constitution it states that they will "promote for the general welfare." But the Government isn't doing so, its just another small flaw of hundreds that the Government  neglects.