You are tasked to write a 2-3 page paper (roughly 300-500 words), adhering to APA formatting guidelines. Your paper should focus on the following topics: 
Identify and discuss the primary sources of data that are used to study police misconduct and corruption. Then, critically discuss the limitations of these sources of data. How might these limitations affect our understanding of the true extent of police misconduct and corruption? Then, shift your focus to ethical considerations within the police force. Is the acceptance of gratuities by police officers a form of corruption?
Finally, propose an early intervention system to control such misconduct or corruption, justify your choice based on evidence from academic literature, real-world examples, or logical reasoning. Explore the potential benefits and challenges that could arise from the implementation of your proposed system.