I've always assumed they just*use a seperatory funnel or something to extract the THC and if you weigh it before and after you can tell how much of what you started with was THC..
easy way to test, sit down, grab a bowl, put some pot in, and light up, then determine how high you are and write it down. and do that each time you smoke to see the difference in thc then youll also know which plants you should make more of.
easy way to test, sit down, grab a bowl, put some pot in, and light up, then determine how high you are and write it down. and do that each time you smoke to see the difference in thc then youll also know which plants you should make more of.
Unless you have a Gas Chromatography machine costs something with 6 figures you either take it to someone that has or you use one of those: http://cannalyticssupply.com/
It's the cheapest you can do for use at home but still not quite cheap!