The FDA bans the nonsteroidal anti-inflammatory drug (NSAID) Phenylbutazone (Bute) in all food-producing animals.
While harmless to horses, bute is a carcinogen according to the National Toxicology Program.
FORBES: Over Public Outcry, Governor Signs Horse Slaughter Bill
It was then further tested and found to contain four parts per billion of bute.
Many horses have received Bute, which is a carcinogen and can cause aplastic anemia in humans.
Lancashire County Council is investigating and the meat will be tested for the veterinary drug "bute".
Separately, tests will be conducted for possible residues in horsemeat of phenylbutazone, also known as "bute".
Opposition parties questioned whether the meeting at Bute House, the first minister's official residence, was appropriate.
The firm has more than 50 schemes in Highland, Perth and Kinross, and Argyll and Bute.
But the global nature of the horsemeat business is also causing problems in tracing exposure to bute.
BBC: UK vets have 'repeatedly raised concerns' over bute in food
Argyll and Bute Council said a few of its schools were closed due to having no electricity.
Argyll and Bute Council said on Thursday that every community in Kintyre now had an electricity supply.
BBC: Homes on Arran lose power again due to a generator problem
Argyll and Bute Council has narrowly voted to put a controversial school closure plan out to public consultation.
In Argyll, 10, 000 households have been affected, as was Bute, with more cut off in south west Scotland.
BBC: Arran could be without mains electricity until next week
Food firms have also been testing products for the veterinary medicine bute (phenylbutazone).
Euphemia Stewart Black . lately headteacher, Achaleven Primary School, Argyllshire (Oban, Argyll and Bute) - For services to Education.
Leslie MacDonald Craig (Furnace, Argyll and Bute) - For services to Piping and to the community in Inveraray, Argyllshire.
The ceremonial faceoff saw former world boxing champions Jean Pascal and Lucian Bute approach center ice from opposite directions.
William Thompson - (Ballachulish, Argyll and Bute) For services to the Millennium Dome.
In 2012, 6% of horse carcasses tested positive for bute, the agency said.
The Mount Stuart Trust owns 28, 000 acres (11, 331ha) on the Isle of Bute.
The volunteers were meeting their local AMs at a reception before the charity's Race for Life event in the city's Bute Park.
In order to get a single therapeutic dose of bute from horsemeat you'd need to eat 500-600 250g horse burgers.
While the FSA insists there is a low risk to health, bute is not allowed to enter the food chain.
In the UK, horse carcasses must have a negative bute test before they are allowed to enter the food chain.
It is extremely unlikely that anyone who has eaten horse meat containing bute will experience one of these side effects.
In minute amounts, bute can cause fatal bone marrow depression diseases, cancer and hypersensitivity reactions in humans, according to researchers.
FORBES: Over Public Outcry, Governor Signs Horse Slaughter Bill
Any companies that have found horsemeat in their products have also been testing for the veterinary painkiller phenylbutazone, known as bute.
Margaret Needham Robbie , lately personal secretary, Scottish Executive (Edinburgh) Staveley Roberts (Kilcreggan, Argyll and Bute) - For services to Yachting.
Phenylbutazone, also known as bute, is not allowed to enter the food chain because it can pose a risk to humans.
His father, John, was a woodcarver to the third Marquis of Bute and William assisted him with carvings at Cardiff Castle.
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