The only documentation about the abusive tactics of LE toward all three is their own statements. Does anyone believe for one minute that LE would allow illegal activities to be documented?
Jessie has said that they knocked the chair out from under him, screamed at him and told him what to say. It is documented in the trial transcripts (Gitchell's testimony) that they played a disembodied voice (one, however, that Jessie knew because he had babysat him) of an eight year old saying, "Nobody knows what happened but me." (This was Aaron Hutcheson, son of Vicki Hutcheson, whose stories were so wild that LE couldn't use them at trial.) Vicki herself testified at the trial, but she has since stated that her testimony was all a lie.
http://www.wm3blackboard.com/forum/index.php?topic=4.0
Here's a link to Aaron's outlandish stories:
http://callahan.8k.com/wm3/img/aaronh.html
Jason told his mother and she posted on Facebook that Jason told her that when he came into the interrogation room, they already had a confession written out for him to sign and that if he didn't sign, they could just throw him in the Mississippi and report him as a runaway.
Damien talks of his LE interviews in his book,
Almost Home. They screamed at him, demanded a confession, refused to let him eat or drink or even use the restroom. Finally, he made it stop by saying to either charge him or release him. At that time, they didn't have Misskelley's statement, so he was released. Later, they arrested him and continued with the abusive and brutal attacks.
I don't know why the transcripts of the arrest interviews (if there were any) are not available. Maybe a legal mind can let us know that one!