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.
A Shetlands height starts at 38 inches tall. A Miniature horses height limit is at 38 inches tall. If a horses height is exactly 38 inches, they can be register in both American Miniature Horse Registry (AMHR) and American Shetland Pony Club (ASPC). There IS a difference between the two breeds. A Shetland can be ridden.