The entomologist claims that the blowfly larva on the dead baby were freshly laid, so the baby died not more than 3 hours before. Firstly flies lay eggs, not larva. And secondly, it takes anywhere from 12 to 24 hours for blow fly eggs to hatch into larva.
Versed, also known as Midazolam, is a benzodiazepine class sedative (similar to Diazepam (Valium) and Alprazolam (Xanax)) that causes sedation, decreased anxiety and memory loss. However it does not cause muscle paralysis.