Good grief! Pigs are walking garbage disposals.
As long as you're not feeding them toxic waste, what bloody difference does it make?
“The Missouri statute that includes vegetables in the definition of garbage originated in 1959 after an outbreak of vesicular exanthema in swine across the country. The law was written to prevent the spread of the disease, which was eradicated in the U.S. in 1959, according to the Merck Veterinary Manual.”
In other words, the law was written to prevent the feeding of ‘toxic waste’ as you put it.