Newly released FBI evidence suggest a syringe filled with chloroform may have been used by accused murder mom Casey Anthony to knock out her 3 year old daughter before she allegedly killed her.

A syringe containing traces of the knock-out drug chloroform was found near Caylee Anthony's remains. 

The findings were made public by FBI investigators forensics unit investigating the case .

Criminal investigators charge Casey searched "How to Make Chloroform" on the Anthony family home computer  months before Caylee went missing.

And forensics also found traces of the chemical in the trunk of Casey's abandoned car.

Anthony's defense attorney claims the FBI analysis will not hurt her case.

"It's insignificant,"  attorney Jose Baez said.  "You can find those chemicals in tap water."