means--
a) being under the influence of intoxicating liquor or a drug having a narcotic effect;
b) a contravention of any law for the protection or the health of employees or for the prevention of accidents, if such contravention was committed willfully or with a reckless disregard of the provisions of such law; or
c) any other act or omission which the Director-General having regard to all the circumstances considers to be serious and willful misconduct.