You can tell by the smell.
The stuff that comes out of my grow room has the best smell and taste. and it is all organic.
Before I started to grow I was only able to find it 1/8 -1/2 at a time and what I got had no flavor or smell and it would give me a head ache half the time. I was fortunate enough to find someone who tought me the correct way and now I feel it is the only way to go. all of my 420 friends Love it to.