Dr. Saadat declined to be interviewed, but denied the accusations in a statement.
Frozen sperm has become a major industry, dominated by a few large sperm banks, but with smaller stocks of sperm maintained at hundreds of assisted-reproduction centers nationwide. The Food and Drug Administration requires that donor sperm be tested for infectious diseases. Beyond that, sperm banks are lightly regulated. Several states require health department licensing of the labs, but only New York conducts routine inspections.