Burgers containing horsemeat could have been made from "diseased or injured animals", environmental health experts have warned.
The head of the Society of Chief Officers of Environmental Health in Scotland said because burgers had bypassed official inspection "there is no way of telling whether the meat is safe".
We note that statements are being made that it is not a health issue, but our concern is that there is no information on how the horsemeat came to be in the burgers.
If it hasn't come through the official inspection system, then there is no confidence that it is completely harmless.
Mr Sleith added that the scandal was an example of a growing problem of "food fraud".
The horsemeat scandal demonstrates how long and complicated the food chain we all depend on is. Regulating our food supply is expensive.
Some of the best, and worst, jokes and gags from Twitter users discussing the discovery of horse DNA in some supermarket beef burgers.
We've seen the jokes on Twitter but the discovery of horse and pig DNA in beefburgers poses a serious question; where did it come from?