Food Standards Agency agrees to independent review of its response.
European agencies say bute risk is low, but say a ban from food chain must remain.
Humane Society International criticizes the breadth of testing of horse meat for drug residues.
Inquiry aims to reveal vulnerabilities within the food chain.
Obama Administration wants Congress to defund inspections of equine slaughter plants.
Decline in first quarter coincides with Europe’s horse-meat contamination scandal.
Two groups have filed a legal petition in New Mexico requesting the adoption a rule that renders any horse “unqualified” for use as food for human consumption.
Same batch went to six local primary schools, the local council says.