Good horse hay ..after rain???

I am just looking for practical experience. All my hay is used by me for my horses,  or sold to others for  horse hay.  There is a strong belief among horse buyers that hay that has ever been rained on is useless as horse hay. I am a little in the middle, thinking that a little rain does not automatically turn hay into garbage, if it is properly re-dried and baled after  rain to minimize mold and dust. Mold and dust are a result of damp hay in the bale. But, can hay be re-dried enough to bale without mold/dust problems? I know there are nutritional losses and DM losses from rain, but can mold and dust be minimized after a dampening.???

Good horse hay ..after rain???