I seem to remember the detective telling AnnieD that LE knew Casey was guilty of harming Caylee (see Annie D deposition). Which seemed to be very upsetting to her, needless to say.
I remember a detective grasping CindyA by the arms and trying to convince her of his theory instead of just taking her statements.....
In, I think it was the JeffH interview, the detective lost his temper when JH expressed his belief that Caylee might still be alive and asked why there wasn't any amber alert or something along those lines....these are a few that spring to mind.
I remember most of the interviews being based on the belief that Casey was guilty, that was the tone in the interviews, all the questions were only about Casey, and sometimes witnesses were actually told Casey was guilty.
These young people were also hearing this same theory in the media, so they were coming into interviews hearing this both from the media and then from LE.
I think in the first interviews with TL and CC, July 17 or thereabouts, didn't the detective, maybe YM, also opened that interview by saying they already knew Casey was guilty, that everything she'd told everyone was a lie, and no one else was under any suspicion? It's been a long time so don't quote me but those would be interviews to look at (they are all on the resources sticky/official documents). I'll try to add links to this post but it might be tomorrow morning
I'm not alleging any kind of misconduct by the detective, I guess detectives can do that, I was just personally surprised and disappointed that that was how the interviews were done.
ETA: Of course the detectives could have something we don't know about, like maybe Casey wrote a confession in her diary that we haven't seen or who knows what.