Interrogation Tactics:
If you only have Misty's word for what happened during the interrogation.
If she has passed the polygraph, as she says? Why would they be still interrogating her over and over trying to find out what happened. I'm sure the LE knew just what was going on during the interrogation. They may have brought someone new into the investigation to get a new feel for what happened or a clear view of the last person to see Haleigh.
From what I have learned from my son if you have to give a polygraph over and over and over it is because it is
"Inconclusive." He also told me there are evasive measures you can take to assure that the polygraph comes out "inconclusive" and not "Guilty" even if you are guilty.
He showed me on the net ... it's "all" there on how to fool the machine.
Sometimes LE will also repeat Poly's for additional info and questions. My son is in law enforcement. He actually graduated from UW Platteville a year ago and is now working and studying for his masters. He is just like my uncle who is a detective in Chicago. In any case they would not tell them that they are "satisfied".