old cow manure - good or bad?
We're new gardeners and we've built a raised bed and filled it with 100% old cow manure and no regular soil (it is pure manure that we were told has basically aged so long that it has turned back into dirt - no smell or traces of anything 'fresh').
We are about a month into this and the plants seem to be thriving, but I'm worrying that there could be dangers and don't want to be eating poisoned vegetables - I've read about the dangers of pathogens, etc. If this was a huge mistake is there anything I can do about it now? Or is this completely safe since it's old?