LE has not confirmed this, but let's assume that duct tape was present. If it was originally wrapped around the head, it would come off during the process of decomposition. The ME stated in no uncertain terms that the body was completely skeletonized and no tissue remained. So rumors that duct tape was found wrapped tightly across the skull's mouth do not make sense.
The bag may have been wrapped in duct tape to keep it closed. Animals tore into the bag over time, but the tape would have been largely intact. It may be that when the "skull rolled out" of the bag it rolled onto a jangle of taped-bag. Another possibility is that Casey taped the mouth on the 19th of June when she noticed decompositional fluid leaking from the mouth. This would help account for tape near the skull. I think the tape on bag theory is more plausible.
Also consider KC's behavior towards her daughter in every single interview with friends and family. Not one ever mentions anything but a loving and doting mother - ever. They do not hold back on her lying and thieving. While it might make an interesting plot in a crime novel, I do not see KC suddenly doing something as inhumane and cruel as wrapping duct tape around the head of her live daughter.
I believe this is where KC's fear of Cindy comes into play. I am not saying it is a normal reaction, but if KC had a dead child on her hands due to negligence, she would have known that 911 was not going to save her but that she had even more to lose in terms of her mother's love and approval. The relationship was clearly unhealthy, and I think it provided the impetus for KC to step into her alternate reality. KC had already developed a well-hewn skill of lying with a straight face.
The child would likely not have vomited while drowning unless there was a resuscitation attempt, which would have not taken place in the water. Urine from a child that small in a pool would have been quite diluted.
As for the cadaver dogs, I am not sure they would hit on a "fresh" body - dead just a couple of minutes. But do remember that on the 18th Casey borrowed a shovel from the neighbor. I believe she intended to bury the body somewhere in the backyard, and she took the body back there while she attempted to dig a hole. The dogs hit on the location(s) she placed the body while trying to dig.
As for chloroform in the trunk. I posted on this elsewhere several days ago, but there are multiple sources. First, chloroform is formed when chlorinated water from swimming pools reacts with organic compounds, and decompositional fluid has organic compounds in it. The forensic report does not specify how much chloroform was measured, only that it was significant. Assume the amount formed due to drowning was not the sole source - where else would it come from?
Three other sources are possible. Some pesticides are manufactured using chloroform as a solvent. Did the parents use such a pesticide to kill the flies and maggots in the trunk? Dry cleaning fluid often contains chloroform. Did the parents use any in an attempt to clean the trunk liner? Fumigants often contain chloroform. Did the parents also use that in an attempt to kill the insects in the trunk?
I feel all of the above combined to create the source of the chloroform.
I also posted on the searches on another thread. I think KC looked up chloroform because she was not sure what it was, but had seen the infamous "Win her over with chloroform" picture on Ric's computer. Ric put the image on his myspace the day after KC did the first search. In fact, that image appeared on a number of unrelated myspace pages in March, 2008.
The second set of searches occurred on March 21:
21-Mar 14:16:30 Search how to make chloraform
14:16:30 Search how to make chloroform Google automatically suggested correct spelling
14:19:16 Clicked a Google syndicated ad
14:20:32 Search self defense
14:21:14 Clicked a Google syndicated ad
14:21:58 Search household weapons
14:22:01 Clicked a Google syndicated ad
14:23:08 Clicked a blog poll hosted by Google http://www.google.com/reviews/polls/...kclr=%235588aa
14:25:12 Clicked a Google syndicated ad
14:25:33 Search household weapons
14:25:54 Clicks http://books.google.com/books?id=_QMJNJIOKPEC&pg=PA79
14:26:18 Clicks http://books.google.com/books?id=_QMJNJIOKPEC&pg=PA79
14:26:24 Search neck breaking
14:28:18 Search shovel
Notice that one of the links is a women's self-defense book (visited twice) and the other is a zombie poll. All of this "research" was done in the span of 12 short minutes and we do not know what other non-Google websites were visited.
Rumor has it that Ricardo may have had a bit of a temper. So...KC finds the image on his myspace....researches chloroform...decides he might be capable of using it on her...researches self-defense...runs across suggestions of how some useful household items might be used in self-defense...such as a shovel...eventually "breaks up" with him in mid-April.
IMHO, the searches are unrelated to Caylee, but coincidentally helped the prosecution when no body was available.
As for the missing person's website visit, AFAIK there is not a single document in the various dumps that shows a search on or visit to such a site. This website visit was reported on Nancy Grace in September, but until I see the document detailing the search and placing it in context, no conclusion one way or the other can be made.