It's disturbing that such horribly inaccurate identification methods are allowed in court, where they can be used to completely alter another person's life.
Were you referring to fingerprints or polygraphs, there? Polygraphs aren't admissible in court in the UK nor, if TV crime drama is accurately informing me, in the US. It's used as a means of intimidating suspects in interviews, not as evidence for use in a conviction.