There are several ranches around here where I can do just that...
Are they *toxin* free?
Not likely... is anything toxin free these days given that we are finding pollutants including dioxins in plants and animals in the remotest regions of this planet?
As an example... and taking nothing else into consideration, including oil spills, bildge dumping etc., I think that the many, primarily plastic, garbage patches in the oceans have contaminated most all saltwater life in our oceans... etc.
Bottom line is for us to do the best we can, where we are, with what we have.