Apple AirTags were designed to help users keep track of important but easy-to-lose possessions such as wallets, purses, and keys. But according to a new report from Vice, nefarious actors across the country are using the inexpensive tracking devices to stalk and harass women.

The news outlet reported this week that it obtained 150 reports from eight of the country’s largest police departments within the last eight months that mentioned AirTags. Of the 150 reports, 50 of them reportedly involved women who alerted police after they started getting notifications that they were being tracked by an AirTag they didn’t own.

According to Vice, 25 of those reports identified “a man in their lives — ex-partners, husbands, bosses — who they strongly suspected planted the AirTags on their cars in order to follow and harass them.”