They are searching for abnormalities in the soil, replanted vegetation and other signs of a rogue grave.
Also, the types of abnormalities reported are not those associated with radiation exposures.
And those errors—called point mutations—can create a fetus with abnormalities.
abnormality ab·nor·mal·i·ty (āb'nôr-māl'ĭ-tē)
An anomaly, malformation, or difference from the normal.