That's not what I meant. What I meant was that, a modern major manufacturer is generally expected to keep logs (usually on computer) of what they use. So I would expect that, when they make a batch of meat raviolis, they would log that batch ABC123XYZ used meat from shipment 1735278 from supplier "George's Meat".
Thus, when horse meat is discovered in batch ABC123XYZ, they can look up the log, call up "George's Meat", and scream at them about that specific shipment, and point the police investigators at the supplier.
In these days, with easy-to-use bar code scanners and cheap compute power and cheap disk space, it's negligent to NOT log things.
They probably do have that information and they’d be doing that investigation now.