A commission rule prescribing cause for removal or suspension of a fire fighter or police officer is not valid unless it involves one or more of the following grounds:
(1) conviction of a felony or other crime involving moral turpitude;
(2) violations of a municipal charter provision;
(3) acts of incompetency;
(4) neglect of duty;
(5) discourtesy to the public or to a fellow employee while the fire fighter or police officer is in the line of duty;
(6) acts showing lack of good moral character;
(7) drinking intoxicants while on duty or intoxication while off duty;
(8) conduct prejudicial to good order;
(9) refusal or neglect to pay just debts;
(10) absence without leave;
(11) shirking duty or cowardice at fires, if applicable; or
(12) violation of an applicable fire or police department rule or special order.