She's accepted as an expert... now talking about how the lab is accredited... how they maintain protocols, SOPs, quality control, etc...
Onto this case - she was asked to analyze 2 items for presence of ignitable liquids... is handed 2 paint cans... she identifies her markings...
Carbon strip recovery - she puts a carbon strip in the can, heats the can, the charcoal strip absorbs the chemicals ..she takes it out, then analyzes those chemicals.
Results on these items revealed the presence of gasoline class products.. (lots of chemistry and talk about various types, but what it boils down to is this was gas.)
Price asks about burn rate. Flashpoint of gas is - 49 degrees fahrenheit (? sounds low)
...Price asks, if gas is poured in dirt/rocks, how long will it be detectable... she says it hangs around about 7 days before it's evaporated... thus the paint cans...
So Price is confirming that the gas was poured on that spot within the 7 days before it was collected.