I'd say for the most part that putting someone on a horse, not knowing for sure if they can ride or not, is a very very bad idea. My sister has a horse though, that we can put anybody on. It doesn't matter if they can ride or not...he takes very good care of his rider. Where did you ride? Was it in an arena? Also, is that a rescue barn? If it is, maybe it's just that the need for horses to be rescued has caused this problem. Because of the economy, there is a greater need than ever to rescue horses. I'm sure a lot of places are getting overwhelmed. Don't give up....try and help.