Often these people become virtual recluses, shunning contact with others or with public venues for fear of coming into contact with an offending chemical. At the other extreme are those who claim that the symptoms reported spring solely from psychogenic causes and are simply manifestations of underlying mental distress. In fact, many MCS sufferers do present with some elements of these syndromes, although it's unclear whether they contribute to the MCS symptoms, result from them, or are merely concurrent with them. In several other states, including Ohio and California, courts have found that MCS qualifies as a handicap for state employment discrimination statutes. Typically these registries require that notice of impending pesticide application to abutting property be given to persons listed on the registry.
Some registries also require notification for painting, repair, and construction.
History MCS, as a medical diagnosis, has been around for more than 40 years. It first came to notice in the early 1950s, but has never gained widespread acceptance in the medical and scientific community. In the mid-1960s, the Society for Human Ecology formed as an umbrella group for physicians dealing with the phenomenon. How to define the condition. The workgroup notes that the most basic disagreement has been how to define the condition, at least in ways that are acceptable to most of the parties involved.