You could begin describing conditions that got you a probation letter (immaturity, poor study habits, family issues, work hours, whatever). An application for transfer can be approved while the applicant is on hisher probationary period.It is easier for employers to release employees during probation, however they need to do so lawfully and provide justification. The duration of the probationary period will be stipulated in the. Contract of Employment. 4.2. Are you legally eligible for employment in the U.S.A? Candidates must be notified in writing of the applicable probationary period before commencing employment. Learn about Public Health - Seattle and King County employment types, hiring and selection processes, application procedures, and probationary periods. The proof can be in the form of a letter from your job or from a doctor, a driver's license showing your birth date, or other similar documents. Complete and submit Form AD507, Probationary or Trial Period Report, when it is received from HRO.