Nerve agents and substances causing injury to the skin and tissue are easily soluble in, and penetrate many different types of material, which renders decontamination more difficult. If chemical warfare (CW) agents have penetrated sufficiently deep, then toxic gases can be released from the material for long periods.
To be a jockey, there are no height limits, only weight limits. A rider can be of any height if they can still make weight, but it is still generally limited to fairly short individuals because of the limits on a person's body. Jockeys typically range from 5' to 5'7 in height. No need to lose any weight.
This means that a dressage horse is nothing but a schooled horse (riding school graduate), and horses presented should be horses that finished the school, not a horse that is in the process of being schooled-hence all the lower levels are for fools, most of whom don t get out of these lower levels in their lifetime.