@Quetzalcoatl Thanks for the try. I admit to being over 40 years since High School science, but has this guy ever heard about the "scientific method"? The guy in the video seems to have no idea how to setup the experiment. Am I wrong in thinking the only two things necessary to test residual cannabinoids left behind in pressed Rosin chips is a sample of the cannabis before it is pressed (what % THC) ? And of course your Rosin Chips. By testing the cannabis before and after pressing you can get the proper answers to the query. When you take your starting value (example only) of 20% THC and then see the chips are (again example) 5% THC you realize that you left behind roughy 25%. Again, my example only, but if you realized that you left behind 25% you would know that you would need about 4 times the weight in chips as fresh cannabis to make your (oil, RSO, tincture or even brownies) desired medecine. While testing rosin chips it is also possible to see the % of THC vs THCA which would show how decarboxylated the chips are or are not. I expect that testing the chips will show that if you desire to ingest the cannabis chips you would still need to decarboxylate the cannabis chips for 40 minutes at 240F.