Release of Probationary and Hourly Instructors. Probationary and hourly unit members may be summarily disciplined, including discharge, at the discretion of the District, without recourse to the grievance procedure. The San Diego Community College District (District) and AFT have an interest in providing a safe workplace, free from alcohol and/or controlled substances. The District prohibits the possession or use of alcohol and/or controlled substances in the workplace or arriving to work under the influence of alcohol or controlled substances.