What must the employer do under the Carcinogens and Mutagens Regulations to establish whether a risk of exposure to carcinogens and mutagens exists?

(2) remove the risk where possible, e. g. by replacing toxic substances or products with non-hazardous ones; (3) reduce the level of exposure as far as technically possible, e. g. by using the substances in a closed system; (4) ensure that exposure never exceeds the limit values set out in MGN 356; and (5) provide information to the authorities on request, e. g. the number of workers likely to be affected by the identified risks.