District employees are prohibited from engaging in any activity which may conflict with or detract from the effective performance of their duties.  No employee will attempt, during the school day or on school property, to sell or endeavor to influence any student or school employee to buy any product, article, instrument, service, or other items which may directly or indirectly benefit the school employee.  No school employee will enter into a contract for remuneration with the district other than a contract for employment unless the contract is awarded on the basis of competitive bidding.