Initial Category 3 training is four hours of classroom instruction and includes demonstration of all related skills. By successfully completing the class, all attendees will be certified by the DODD. This certification is valid for 1 year and requires annual renewal. You must have a current, valid Category 1 certification, at least one hour of continuing education (in addition to Category 1 and Category 2 continuing education) and an application form for renewal signed by employer verifying background check requirements.