The new commandant R.G.B. Spicer Esq, CMG MC, took up his duties on 16th July, 1931 and adopted the title of Inspector General of Police. He then set about reforming the police following Dowbiggin's blueprint.

The separate constabularies, previously maintained by Tel Aviv and the larger municipalities, were converted into State Police.

The British section was increased from 365 to 630  and integrated into the mainstream activities of the Force. New recruits included 100 former members of the Brigade of Guards. Police in the British section now had to learn Arabic, carry out routine police duties in Police Stations alongside their Palestinian colleagues. In practice,in rural areas, this meant working with Arab policemen as the Jewish settlements still retained their own Notrim where the only British policeman was a commanding officer. The comradeship with their Arab colleagues often affected the attitudes of the British police who had little experience of working with the Jews. This was particularly the case post war.

To implement Dowbiggin's recommendations, in 1932 Spicer established a forensic laboratory at Palestine Police Headquarters on Mt. Scopus three years before its English counterpart. There police conducted ballistic, blood and semen analyses, and identified firearm markings and fabrics.

Not only the police went through an upheaval as a result of the 1929 riots but Zionists and Arabs changed their outlook as well. Some members of Haganah, disappointed by its inability to defend Jews against mob attacks, broke away to form Hagana Bet (later rename Irgun) under the leadership of the absent Jabotinsky and his allies who advocated a more militant policy against Palestinian Arabs.

As for the Arabs militants - they formed a new rebellious group, known as the Black Hand.