A communication device , comprising: an authentication engine operable to receive a user-originated voice biometric input and determine one of: a successful user authentication based on a voice biometric matching threshold; and an unsuccessful user authentication based on the voice biometric matching threshold; a database for building an individual user profile based on successful user authentications, the individual user profile comprising non-voice usage parameters collected during successful user authentications, the database being suitable to generate non-voice usage compensation controls for compensating control verification based on the non-voice usage parameters collected during successful user authentications; wherein the authentication engine is further operable to receive a valid user PIN entry, indicative of a valid user, and to further determine false rejections and valid rejections, wherein when the unsuccessful user authentication based on the voice biometric is followed by a valid PIN entry, then a false rejection is determined; and wherein the authentication engine , subsequent to the detection of a false rejection and detection that a user individual false rejection rate exceeds of a public safety population norm, is further operable to decrease the voice biometric matching threshold to decrease the individual false rejection rate and enable the non-voice usage compensation controls to perform compensating control verification, thereby maintaining security while the voice biometric matching threshold was decreased, wherein the user individual false rejection rate is calculated based on the number of false rejections incurred by the user. an authentication engine operable to receive a user-originated voice biometric input and determine one of: a successful user authentication based on a voice biometric matching threshold; and an unsuccessful user authentication based on the voice biometric matching threshold; a successful user authentication based on a voice biometric matching threshold; and an unsuccessful user authentication based on the voice biometric matching threshold; a database for building an individual user profile based on successful user authentications, the individual user profile comprising non-voice usage parameters collected during successful user authentications, the database being suitable to generate non-voice usage compensation controls for compensating control verification based on the non-voice usage parameters collected during successful user authentications; wherein the authentication engine is further operable to receive a valid user PIN entry, indicative of a valid user, and to further determine false rejections and valid rejections, wherein when the unsuccessful user authentication based on the voice biometric is followed by a valid PIN entry, then a false rejection is determined; and wherein the authentication engine , subsequent to the detection of a false rejection and detection that a user individual false rejection rate exceeds of a public safety population norm, is further operable to decrease the voice biometric matching threshold to decrease the individual false rejection rate and enable the non-voice usage compensation controls to perform compensating control verification, thereby maintaining security while the voice biometric matching threshold was decreased, wherein the user individual false rejection rate is calculated based on the number of false rejections incurred by the user. <EOS>