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Errors and Need to Verify Alerts <br />•The error rate cited for ALPR “hits” varies from 5% (Flock claims) to 35% (a Vallejo study), while most seem to place the range between 10-20%. That is due to both limitations of the license reader technology and erroneus or outdated information in the “hotlists” (which are supposed to be updated daily). <br />•ALPR error prompted a major lawsuit in SF (the Denise Green case) where the federal district court ruled that the City was liable when an ALPR alert was relied upon to initiate the stop and detention without taking steps to independently verify the information (e.g., by checking the license plate information against the CA state CLETS database). <br />•This is why independent verification is so important to complement the ALPR alert system.