"Just cause" may consist of any one or more of the following:

(1) Incompetence;

(2) Wilful neglect of duty;

(3) Wilful violation of the rules and regulations of the State Board of Education;

(4) Unprofessional conduct;

(5) Drunkenness;

(6) Cruelty;

(7) Crime against the law of this State or the United States;

(8) Immorality;

(9) Any conduct involving moral turpitude;

(10) Dishonesty;

(11) Evident unfitness for position for which employed; or

(12) Sale or possession of narcotics.