http://sls.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/technologies/biometric-surveillance
These methods rely heavily on algorithms to identify certain characteristics from a sample, like the image of a face or the sound of a voice, and match it to one other particular sample or a group of samples. Biometric identification can be flawed due to issues in the algorithm, gaps and biases in the training data, and problems with the samples used.