In order to prevent the development or aggravation of an occupational disease or an occupational accident risk lying in an individual employee the Swiss National Accident Insurance Fund (Suva) based on the Swiss Law on Accident Insurance is entitled to prohibit certain activities that have proven to be hazardous to the individual (declaration of "unsuitability" (DOU) or rarely declaration of conditional suitability). Occupational skin and respiratory diseases are the most frequent disorders, and flour; cement, isocyanates and hairdressing substances the most important occupational factors requiring a DOU. This measure also provides financial security to the employee for up to 4 years by the accident insurer in cooperation with the unemployment insurance. For retraining and occupational rehabilitation a special state insurance, the Invalidity insurance is responsible.