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Forensic Evidence (Entomology) in the Casey Anthony Case

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Schatzie has bachelor's degrees in animal science and English and a master's in education.

Casey Anthony was found not guilty of murdering her daughter...but insect evidence tells a different story.

Casey Anthony was found not guilty of murdering her daughter...but insect evidence tells a different story.

Insect Evidence in the Casey Anthony Trial

Though Casey Anthony was found not guilty of murdering her daughter, her 2011 trial offered a real-life, high-profile case study of how insect-based (entomological) evidence can be used in criminal investigations. Many criminologists and court analysts have argued that this evidence, along with the other forensic evidence gathered by prosecutors, makes a compelling argument for guilt.

Sometimes, however, juries may lack an understanding of the value of forensic data. At times, perpetrators get away with murder despite seemingly sound evidence.

Was that the case here? Did Casey kill Caylee? Everyone is entitled to his or her opinion, but there is only one set of entomological facts.

The jury found the following details either questionable or inconclusive. Or they may have just ignored or forgotten about them. Here is an overview of what the prosecution presented in court as part of their case. Based on the following facts, you can come to your own conclusions.

The scuttle/coffin fly can play an important role in criminal investigations

The scuttle/coffin fly can play an important role in criminal investigations

The Critical Bugs in Play

Entomological experts analyzed the trunk of Casey's Sunbird, as well as the contents of a white plastic bag found in it. They discovered a type of fly, the scuttle/coffin fly, to be present. There was also a blowfly leg.

Several other bugs were identified in addition to these; however, the two mentioned here are the most important in determining what happened to Caylee and when.

Linking a Mother to her Daughter’s Disappearance

The first question is whether or not Casey’s car was a crime scene. First let's review a few timeline facts.

What we indisputably know:

  1. Caylee, Casey’s 2-year-old daughter, was last seen alive on June 16th, 2008.
  2. Casey’s car, a Pontiac Sunbird, was abandoned at Amscot on June 27th and impounded on June 30th.
  3. Skeletal remains of Caylee were found December 11th.

The Body-in-the-Trunk Theory

While decaying matter was present in the trunk, it could have originated from a deceased animal instead of a person.

However, a very specific type of scuttle fly was present. While it does also infest animal remains, it is the most common fly seen upon considerably decayed human corpses.

As further support of the body in the trunk theory, when Caylee's skeleton was found in December, it harbored less than 100 blowfly specimens. This is highly unusual for a body left out in the open. Blowflies typically land on a body before most other insects and reproduce rapidly, so there should have been a lot more of them. That is, unless they couldn't access the body for some reason (because it was in the trunk, for example).

While not inarguably conclusive on its own, this entomological evidence strengthens the case against Casey Anthony.

Odors in the Car

The prosecution also used odor analyzing technology on Casey's car. They found both chloroform (the substance Casey allegedly used to incapacitate her daughter) and some of the 400 chemicals emitted by dead human bodies. Hair was present with darkened bands, suggesting it originated from a deceased person and not a living individual, and cadaver dogs hit on the Pontiac’s trunk in July.

Suddenly, given enough supporting evidence, the possibility Caylee was stored in the back of Casey’s car becomes probable, if not highly likely.

Casey's Pontiac Sunbird

Casey's Pontiac Sunbird

Cleaned in the Dead of Night, But Why?

As blowflies are relatively large, their entry into a closed trunk would be impossible. Because only one blowfly leg was found in the Pontiac's trunk, the body was most likely placed in the trunk soon after death (before the flies could colonize it) and left there without being accessed again (that is, until disposal).

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Further, this disposal probably occurred after dark, or there would have been more blowfly specimens found that flew in as soon as the trunk was opened. They would have had good opportunity to gain entry, as the plastic bag left in the trunk contained multiple paper towels soiled with decaying fluids. This suggests someone attempted a clean-up that took at least a few minutes.

Why clean a car in pitch blackness? And why do such a hasty, incomplete job that the trunk still reeked afterward? Why not dispose of the materials used in the cleanup attempt? Did Casey have something to hide, or is she just inept at disinfecting residual roadkill? So inept that she decided just to abandon her still-dirty car instead of doing a better job at cleaning it?

Establishing a Timeline

Let's return to the timeline. What else does the presence of flies indicate?

One type of scuttle fly, known as the coffin fly, found in the trunk derives its name from its ability to dig up to six feet underground and infest buried remains within graveyards. The size of a gnat, it is also capable of invading spaces using the tiniest of openings through which the larger blowfly cannot squeeze.

Therefore, the scuttle fly could easily gain access to a body placed in a trunk, but would only have actively sought it out once it was considerably decayed. Scuttle flies, which typically feed on old carrion, do not like fresh remains.

How long did the corpse remain in the car? The presence of coffin flies indicates that it must have been left in the trunk long enough to have decayed significantly. But how long did that take?

The Weather

The time period in question, June 16th (Caylee’s disappearance) through June 27th (when Casey’s car was abandoned, the body supposedly removed) was very hot; decomposition would have been quick.

Because heat increases several decompositional processes: autolysis (enzymatic carrion breakdown), putrefaction (bacterial and fungal carrion breakdown) and infestation (fly, beetle carrion breakdown), extensive decay occurred within 96 hours.

During this time, the body would have gone from fresh decay to a more advanced stage in which several fluids were secreted (attracting scuttle flies). Accordingly, the body could not have been moved before reaching this stage, or before the 19th, or else these fluids and the scuttle flies attracted to them would not have been present.

Furthermore, because the remains did not reach such advanced decay as to emit decompositional grease (none was present in the trunk), it is believed that they were taken out likely before June 23rd.

The theory of a June 22nd or earlier removal is also supported by the fact that in addition to hot ambient Orlando, Florida, temperatures, solar radiation would have increased these already elevated temperatures within the space of the trunk. It is likely that the enclosure reached an excess of 90 degrees Fahrenheit for the three to four days following Caylee’s death in which she was believed to have been stored in it.

This heated atmosphere affects the flies themselves. In warmer climates, bug growth is accelerated, creating a larger population in a shorter amount of time. This was taken into account December 11th after Caylee’s body was discovered and scientists attempted to pinpoint when she first died.

A Bug’s Lifecycle Helps Determine the Victim's Time of Death

By analyzing the puparia (structures larva hatch from and leave behind when they become adults), larvae, and adult specimens of several species found on and around the skeleton, scientists worked backwards through elapsed lifecycles to estimate the time of first infestation, or when eggs were laid by the insects which first landed upon the corpse.

Completing this process led to the conclusion that Caylee was killed during the period of late June to July. Though the body wasn’t discovered until December, death occurring after July was, due to entomological evidence, ruled out.

In Closing

Forensic entomology allowed scientists to verify that Caylee Anthony's body was, at one point, likely present in the back of Casey's car. Further, they determined through a series of analytical procedures, that she would have been left there for at least four and up to six days after her June 16th disappearance. Bugs even helped pinpoint the time of removal to after dark.

This information, when added to other forensic evidence, makes the case against the mother of Caylee quite convincing. However, the jurors decided it was not convincing enough.


Jo Douglas from Canada on April 02, 2020:

I read an article recently where he father is now willing to talk to her? Seriously? So was everything they said about her guilt and them supporting Caylee just more lies? That entire family is just sick and evil

solersimonlaw on April 01, 2020:

Great discussion of the use of entomology in forensics.

Jo Douglas from Canada on March 26, 2020:

The double jep law is the only reason that sick monster is still free today. I pray she never has another child.

Suzie from Carson City on September 11, 2019:

Schatzie.... I have no idea what made me click on to this article. I guess maybe a pull from my past obsession with the entire OUTRAGEOUS case! I knew this case beginning to end, front to back and every tiny bit of everything in a zombie, I was hooked and I couldn't control my need to see it through.

I must say though, the sight of that lying, psycho Bi-otch's face, never fails to turn my stomach. If ever there was an intense case of a pathological LIAR, Casey is the ultimate. I still wait with deep longing for this piece of garbage to get her visit from Karma.

(At least the "other" masterful Liar, psychotic killer, Jodi Ann Arias got her due! Her butt is locked up for life, as it should be. Amen.)

Great article Schatzie. Be grateful we did not know one another while this case was in the lime light. I would have communicated my outrage and frustrations with you daily....until you hated me!! LOL Peace, Paula

Schatzie Speaks (author) on August 23, 2019:

Hi Caliente,

Thank you for sharing your opinion. According to the jury members themselves, they said it came down to evidence, and they weren't 100% convinced by the prosecution's case. Casey has been called the most-hated mother in America...she is hated by a majority of Americans, across the country. There was widespread outrage at her sentencing. That doesn't sound like she's enjoying any kind of immunity due to white privilege to me. It seems like for some reason or another, she just got lucky with that jury and pretty much any other 12 people would have found her guilty.

Schatzie Speaks (author) on August 22, 2019:

Hi, BobL,

That is true. She may not have been officially convicted, but everyone--except for those on the jury-- seems to know better.

Schatzie Speaks (author) on August 22, 2019:

Hi, My,

No, unfortunately. This isn't new evidence; this was presented at the trial. For whatever reason, the jury didn't think it proved her guilty beyond a reasonable doubt.

BobL on August 22, 2019:

Its amazing the Jury could not bring themselves to convict her of this utterly horrible crime. A parent of a young dependent chid, having thoughts of only herself, versus her child. Being so cold hearted togo about her life as if she never had Caylee.

She was found innocent of murder but in the court of public opinion she is of the most vile crime of murder.

Thank you for helping those who did not clearly see the guit.

Thank you again

My on August 20, 2019:

Do you believe that this may get the. DA to try and reopen the case. I think how sad it’s to think that a child life was taken and that she never got to enjoy life. I believe that the grandparents would have raised her had the mother just asked them to

Schatzie Speaks (author) on August 05, 2019:

Thank you so much, JC, for your kind words and for taking the time to comment!

JC Scull on August 05, 2019:

Good job.

Schatzie Speaks (author) on August 04, 2019:

CJ Kelly, thank you so much.

This case has always frustrated me as far as the verdict. I went digging through all the evidence hoping it could explain the jury's decision, but it did the opposite. Now, it's even more frustrating!

CJ Kelly from the PNW on August 04, 2019:

Great detail. Good job.

If they had charged her w/manslaughter instead of murder, I think she would have been convicted.

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