tests bad is there any way to remediate the compost

So my new supplier of horse manure compost can’t be for sure if grazon was used and I called their supplier of hay and straw and they can’t say for sure If any was used! I already had it delivered. 6 trailer loads. How can I test it and if tests bad is there any way to remediate the compost? Will composting worms eat through it and clean it up? I’ve heard they sterilize and clean up bad soils? I have no shortage of worms to throw in there for 6 months to do their thing If that will work otherwise any other suggestions welcome! I don’t want to ruin my garden!

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