1. A method for providing error discrimination in a biometric authentication system, said method comprising: inputting from a user one or more biometric samples; selecting from among a plurality of available processing units, a set of processing units which will generate intermediate results from the processing of said inputted one or more biometric samples; processing at least a portion of said inputted one or more biometric samples by said selected set of processing units to at least provide said intermediate results; and arbitrating said intermediate results by a security token to generate a final result which at least meets a predetermined security policy, wherein said arbitrating is performed by a plug-in module operatively installed inside said security token.