We usually have our own alfalfa we feed in winter only. Pasture only all summer. We've had to let our alfalfa sit out past 3 years and have been rotating that patch in corn/soybeans. I've been buying alfalfa from my neighbor since. I don't do any testing, and I've never heard of anyone in this area doing it either. Plus, it'd be a slap in the face to my neighbor considering it's a 2nd year alfalfa field, so you couldn't ask for any better! Add to the fact, if I don't buy, he has a list of 100's of people that would buy every bale he could bale!! Yes, his field is sprayed... If it wasn't, the bugs/worms can't wipe out a field pretty quick in some years!! I occasionaly feed some grass hay, but not alot of it....