Google: We are only looking for Child Pornography
Google isn’t searching your emails for other crimes, the company told Business Insider, even though a registered sex offender was recently arrested after Google tipped off authorities to alleged child pornography images in the mans email.
Google also purports that it cannot mistake an innocent photo for an illegal one, but it does look for illegal imagery. Internet companies have worked with the National Center for Missing & Exploited Children to create a database of child pornography pictures. Each one of the images is given a unique numerical number like a fingerprint, known as Hash. When Google scans Gmail or the Web, its looking for those fingerprints and if it finds any suspicious images, it reports it.
Google Terms of Service tell you that you must follow the law when using its services and warns you that it analyzes your emails and other documents that you upload to serve your ads and perform services like scanning for viruses. A source close to Google told Business Insider that the Hash technology that websites like Facebook, Google and others use to look for child pornography was developed by Microsoft.