idea behind that is that, if this interview was shown in court, it gives a clear picture of you. the other is a global view of the room. everyone who is in the room is shown in the picture. that's about showing exactly what happened. >> and, this was key. no more lying! in america it's legal for cops to lie to suspects. not here. >> could you, for example, go into this interview and say, i have a certain specific piece of evidence that tells me you are guilty, if you don't have that evidence? >> no. absolutely not. >> can you talk to a suspect for as long as you want to? >> no. you should only interview for two hours at a time and should take recognized breaks at mealtimes. prayer times and nighttime. >> someone a little challenged, like robert. >> they're entitled under the law to what's called an appropriate adult. it might be a parent. might be a social worker, but they are entitled to that as well as their legal representative. >> but when the interrogation rules were changed, many veteran officers were not happy.