In "Least painful way to die" we get an answer ...
Companion animals (e.g., dogs and cats): injected barbiturates are recommended
Laboratory animals (e.g., mice and rats): injected barbiturates are acceptable as are inhaled agents (isoflurane, carbon dioxide).
And assume the butcher guy as soon as he comes to know the animal is gone, he will do the following....
A very sharp knife is used in this process: the point of the knife cuts into the animal's throat and cuts through the dewlap, trachea, esophagus and jugular vein immediately below the jaw-line to allow the blood to flow out.........Animals are bled out before being dressed because it prevents blood from coagulating in the tissues and thus making the meat go rancid. (Source Slaughter Cattle commercial method - Step 6)
Here's my question... What if the animal was killed using 'barbiturates', then is that animal safe for eating by humans or the high levels of 'barbiturates' in that body cause unwanted results in humans too (if they consume it)?
I'm new to biology. :)