challenged, like robert? >> they're entitled under the law to what's called an appropriate adult. now, that might be a parent. it might be a social worker. but they're entitled to that as well as their legal representative. >> but, when the interrogation rules were changed, many veteran officers were not happy. they resisted. detective trevor bowles remembers it well. >> senior people thought that this was a draconian piece of legislation that was going to prevent us from ever detecting anything ever again. >> you'd never solve a crime anymore. >> we'd never solve a crime anymore, that it was gonna tie our hands behind our back and we would be unable to work with it. and they were wrong. >> very wrong. not only did false confessions all but stop, crime solving got better. >> detection rates in respect of homicide in the u.k. are very high. they're up in the 90% mark. >> and along the way, said griffiths, confessions, a hallmark of case-solving in the u.s, became much less important here in britain. >> we would not prosecute somebody on -- solely on a