Also in 1919, the MPD established a "School of Instruction" on the third floor of the 7th Precinct. This was the early forerunner to the Training Bureau and today's Metropolitan Police Academy. A group of 22 officers took a 30-day course in the fundamental duties of police officers, the law of arrest, and court procedures. By 1930, an official training school was established. The school expanded the original course work to a three-month period, and brought in outside experts from various fields to instruct.