The constitutional question of whether extracting cognitive memory responses directly from implanted neural interfaces violates the privilege against self-incrimination.
Under Schmerber v. California (1966), the Fifth Amendment shields criminal defendants only from compelled testimonial communication, not from compelled physical evidence such as blood tests or fingerprints. Brainwave decoding challenges this dichotomy: while EEG voltage pulses are physical biological signals, decoded semantic thoughts or guilty knowledge reactions (P300 waves) represent cognitive testimony.
