Hey fellow composters!

I have come upon a source for horse manure and would like to use it in composting. The horse owners feed the horses costal and alfalfa hay. I am concerned about the residual effects of Picloram that may have been used in the costal fields. Can anyone share the test method to ensure that the manure is Picloram-free?

Thanks a million!

Bluestem:
Thanks for the reply re: picloram testing - just what I was looking for!