How did the role of the police evolve in the 20th century?

In 1900 there were 60,000 police; by 2000 there were over 125,000. Over the century they became a much better-trained force. In 1900 new recruits learnt the job by doing it; now each has 14 weeks training.

Explanation: The 1829 Metropolitan Police Act created a modern police force by limiting the purview of the force and its powers, and envisioning it as merely an organ of the judicial system.

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