## Biometric HALs ## --- ## Overview: ## The interfaces within the biometrics.* HAL tree are used by the Android Biometric Services (e.g. FingerprintService, FaceService) to discover and operate biometric sensors on the device. More details and versioning information can be found within each particular HAL. More complete information about the Android Biometric HALs and subsystem can be found at [source.android.com](https://source.android.com/security/biometric).