(d) Each school district shall provide dating violence training to all administrators, teachers, nurses and mental health staff at the middle and high school levels. Upon the recommendation of the administrator, other staff may be included or may attend the training on a volunteer basis. The dating violence training shall include, but not be limited to, basic principles of dating violence, warnings signs of dating violence and the school district's dating violence policy, to ensure that they are able to appropriately respond to incidents of dating violence at school. Thereafter, this training shall be provided yearly to all newly hired staff deemed appropriate to receive the training by the school's administration.