More law enforcement agencies are using Google location data for both violent and non-violent crimes. Location data is collected by Google itself through location sharing options, by analyzing WiFi networks a phone recognizes, and through location-sharing with apps.
A major concern is that this data is obtained through geo-fenced warrants, which disclose private information of everyone in the area, including innocent bystanders and victims. Geo-fenced warrants have faced scrutiny in courts, but many law enforcement agencies take steps to obscure their use is cases to avoid key evidence being thrown out over 4th amendment violations.