didn't commit. to prevent that very thing, police departments in many other countries banned or dispensed years ago with interrogation techniques still used in america. had the murder happened elsewhere, for example, here in the united kingdom, it's probable that robert would still have been brought in for questioning, he was named as a suspect by others in the case. but the chances he would have been charged or even interviewed for very long, close to zero. >> the interview as it is on the recording would not be legal in the uk. and that evidence would not have been admitted at trial. >> this is andy griffiths. 26 years a detective in the sussex police department. internationally recognized for his work in investigative interview techniques. when he was a rookie, british interrogation rules were much like they are in the u.s., but they are not anymore. >> what happened to precipitate these changes inhe united kingdom?