Employees are to notify their immediate supervisor of any criminal drug statute conviction for a violation occurring in the workplace no later than five (5) calendar days after such conviction. The District will investigate and take remedial action within thirty (30) days whenever there is a reason to believe that the unlawful manufacture, distribution, dispersing, possession or use of an illegal substance is present. Employees in violation of the basic policy are subject to disciplinary action, up to and including dismissal. Retention of an offending employee is contingent upon satisfactory participation, at employee expense, in a drug or alcohol abuse assistance or rehabilitation program approved for such purposes by a federal, state or local health, law enforcement or other appropriate agency.