in an attempt to reduce re-segregation. In 2001, a federal court of appeals declared that the district's schools were "unitary", meaning that they were sufficiently integrated and federal monitoring was no longer required. Security The school district utilizes Hillsborough County Public Schools Security Services and the Hillsborough County Sheriffs Office at many schools around the county. Known as School Resource Officers, they provide armed security along with other services where they are assigned. Other jurisdictions assist with service calls in a backup capacity. These agencies include Plant City Police Department, Temple Terrace Police Department, and Tampa Police Department. During some local school sponsored sporting events the district will utilize the Florida Highway Patrol, USF Police Department, and Tampa Airport Police Department in conjunction with the other agencies to provide security. Since the school sponsored events are generally served by off-duty law enforcement officers, other local agencies may also be present. Gates Foundation grant In 2009, the Hillsborough County School District was awarded a $100-million-dollar grant by the Bill and Melinda Gates Foundation to improve education through improved mentoring and evaluation of teachers. For six years, the grant funded the "Empowering Effective Teachers" plan. Empowering Effective Teachers Empowering Effective Teachers was an initiative to promote improvements in education in the school district by increasing effective teaching through new teacher assessments, salary scales, teacher training programs and recruitment. The early phases of the initiative rolled out in 2010, when the district's teacher evaluation form was radically redeveloped into a complex rubric with four areas of focus and multiple subpoints within each area. The new evaluation standard caused an uproar in the district, mainly due to how classroom evaluations have been implemented since the plan's roll out. Across the state of Florida, 40 percent of a teacher's final evaluation score now is determined by calculating students’ learning growth from one year to the next, and a similar policy has been implemented across other states. In response to the increased demands placed on teachers by the new evaluation system, teachers who opted into the new system would receive a pay increase. The initial increase for most was at least a few thousand dollars, with those earning evaluation scores of 4 or 5 receiving an additional $2,000 or $3,000 each year, respectively. The new pay scale was released at the end of 2013, and all teachers hired before 2011 had a few months to evaluate