Official : Federal agencies need to set limits on potentially harmful chemical residues . In U.S. , there are no legal limits for some heavy metals , like lead , in beef . The U.S. government is not fully guarding against the contamination of meat by traces of antibiotics , pesticides or heavy metals , a new report warns . Study focused on contamination by biological agents , rather than bacteria .
Official : Federal agencies need to set limits on potentially harmful chemical residues . In U.S. , there are no legal limits for some heavy metals , like lead , in beef . Study focused on contamination by biological agents , rather than bacteria .