Android's Verify Apps feature performs malware scans on newly downloaded applications to make sure they're safe. But since some malicious apps can prevent the feature from working, the company had to find an alternative way to figure out if a phone stopped using Verify because you no longer use it or if it's due to malware lurking in your device. In a blog post on Android Developers, Google explains how it detects if a particular application is harmful even with the absence of Verify's verdict. "To understand this problem more deeply," the post reads, "the Android Security team correlates app install attempts and Dead or Insecure (DOI) devices." To note, the team marks devices that stopped checking up with Verify as DOI and those that continue to use the feature as "retained."