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Factors to consider <br />•Generally speaking, the effectiveness of ALPR queries/alerts for recovering stolen vehicles/license plates are most successful for shorter retention periods of time, while utility for investigations for more serious and complex crimes can benefit from longer retention periods. <br />•Civil liberty advocates tend to take the position that retention periods should be as short as possible, for longer retention periods raise greater privacy concerns that the movements of law-abiding persons can be more readily tracked and improperly used. <br />“Taken in the aggregate, ALPR data can paint an intimate portrait of a driver’s life and even chill First Amendment protected activity. ALPR technology can be used to target drivers who visit sensitive places such as health centers, immigration clinics, gun shops, union halls, protests, or centers of religious worship.” (From the Electronic Frontier Foundation website) <br />•Additionally, mobile cameras potentially pose a greater risk to privacy (e.g., as police vehicles patrol neighborhoods throughout the city and not just at fixed sites).