Creepy crawlies in concrete: Is it possible to determine post mortem interval of bodies encased in concrete?

Law enforcement agents and entomologists often use forensic taphonomy to estimate the time of death.  Although not common, law enforcement agents have discovered humans concealed in concrete encasements and under sidewalks.  Arthropods have distinct and predictable succession patterns when able to access decomposing bodies.  This research examined insect succession patterns on two control pigs positioned on top of soil, three concealed underneath concrete slabs, and two that were completely encased in concrete.  During this 100-day study (September 2011 to January 2012), internal temperatures were monitored and compared to ambient air temperatures with thermocouples.  Insect succession paralleled previous studies.  Insect larvae and pupa were found underneath concrete slabs and in fully encased concrete pigs.  Although insects obtained access to pigs concealed under a simulated sidewalk and encased pigs, decomposition was slowed tremendously when compared to the controls.   The results of our study indicate that apparent post mortem of bodies concealed in concrete will be much less than actual time elapsed since death.